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The Physics That Curves a Ping-Pong Ball Just Showed Up in Quantum Light

15 September 2026 at 23:21
AI Generated Illustration of Quantum Spin EffectResearchers have directly observed the optical Magnus effect for the first time, revealing a tiny shift in laser interactions that could affect the precise control of qubits in quantum computers. Anyone who has watched a spinning soccer ball curve around a defensive wall has seen what happens when spin changes an object’s path through the [...]

Scientists Turn Sunlight Into Quantum Entanglement

By: Optica
15 September 2026 at 15:23
Solar Concentrator Creates Entangled PhotonsScientists have turned ordinary sunlight into a source of quantum entanglement, opening a surprising path toward more energy-efficient quantum technology. Quantum technologies often depend on powerful lasers that consume significant amounts of energy. As these systems grow larger and more widespread, their energy requirements could become an increasingly important concern. Now, researchers have demonstrated that [...]

Fall stargazing 2026: The best skywatching sights in autumn (and how to see them)

13 September 2026 at 20:24

With fall now upon us, many of us will be dusting off our binoculars and telescopes ready for the longer nights this season brings. Earlier sunsets mean more stargazing hours, and we'll start to see the return of some favorite celestial sights and deep-sky objects that we haven’t seen since before spring.

Fall is also an excellent time for casual stargazers, with the earlier evenings and cooler temperatures offering a comfortable compromise before we head into those freezing winter nights when we can't feel our toes. Don't worry if you're just starting out and don't have any gear yet, as many of this season's celestial objects are visible with the naked eye — and some are actually best viewed that way.

This September, October and November are great times to view the distant planets at opposition, catch several meteor showers and photograph far-flung galaxies and nebulas with your smart telescope. Plus, November brings the first full supermoon of the year. So, grab your telescope, your headlamp and a cozy sweater, and let's see what lies ahead.

Lunar & Planetary events

Neptune at opposition

An artist's illustration of Neptune, with faint streaks of wispy white clouds.

(Image credit: Getty Images)

Neptune reaches opposition on September 26 at 02:00 UTC, which is the best time to view it at its brightest, magnitude +7.8. Unfortunately, the full moon will somewhat ruin the party, and Neptune isn't particularly easy to spot at the best of times. That said, the opposition window lasts for several weeks, so waiting a couple of weeks to observe during the new moon week won't make any noticeable difference.

You'll need a good telescope to spot the big blue planet — at least a 6-inch aperture, although an 8-inch or bigger will give you the best chance. Make sure you have a good quality, high-powered eyepiece (something like a 6mm or 9mm) or a good Barlow lens to boost the magnification of your existing eyepieces.

But even with high magnification, Neptune will only appear as a small disc with a bluish hue — you won't see any cloud bands or surface features, because it’s just too far away. Still, it's worth trying to get a glimpse anyway.

Saturn at opposition

An image of Saturn

(Image credit: NASA / Hubble)

A week later, on October 4 at 12:00 UTC, Saturn reaches opposition, shining at magnitude +0.3. It will be easily visible to the naked eye, although to see Saturn's rings or any of its largest moons, you'll need a telescope.

The moon will be just below 50% illuminated and doesn't rise until past midnight, so you'll have a good portion of the late evening to observe Saturn while it's high in the sky before the moonlight affects visibility. Even though the rings are only partially tilted, you can still make out a lovely golden oval around the planet, and in larger telescopes you'll be able to spot the Cassini division. We recommend a telescope with at least 4 or 5 inches of aperture, and a good quality, high-powered eyepiece to observe the finer details.

Full supermoon

Photograph of a full moon.

(Image credit: Dawn Villwok-Joerg/Getty Images)

November 24 brings the first full supermoon of fall/winter, when the bright Beaver Moon will light up the skies, shining around 15% brighter than a normal full moon.

You can enjoy this moon without any gear whatsoever, but observing with binoculars or a telescope, or capturing its magnificence with a camera, makes the experience much more enjoyable.

Until then, you can catch the other full moons of the season on September 26 and October 26.

Uranus at opposition

an illustration of Uranus

(Image credit: ARTUR PLAWGO / SCIENCE PHOTO LIBRARY via Getty Images)

The third planetary opposition of the fall belongs to Uranus on November 25 at 23:00 UTC. But like Neptune in September, the almost full moon will dampen its visibility, so we'd recommend waiting until the new moon week.

Like the other outer planets, you'll need a larger telescope with an aperture of at least 6 or 8 inches to view Uranus, alongside a good quality, high-powered eyepiece for the best views. These larger scopes gather enough light to distinguish Uranus's turquoise color, although you'll need to go even bigger if you want to see its brightest moons.

Meteor showers

Draconids

A meteor falls to Earth with a green aurora in the background

(Image credit: Getty Images)

The first meteor shower of the season — and unlike most showers, which involve a lot of caffeine and an all-nighter, the Draconids are best seen in the late evening instead of the dead of night.

This meteor shower is active between October 6-10, peaking on the night of October 8-9. With the radiant point in Draco being highest at nightfall and the thin crescent moon not causing any interference, the best viewing hours are in the late evening before midnight.

These meteors are leftover debris from comet 21P/Giacobini-Zinner, and you can expect to see around 6-10 meteors per hour under ideal conditions.

Orionids

A shooting star streaks behind a lighthouse on a starry night

(Image credit: Mountain Light Photography Inc via Getty Images)

The Orionid meteor shower happens every October, when Earth passes through the trail of debris from Halley's Comet. In 2026, it's active between October 2 and November 7, with the peak occurring on the night of October 21-22. This shower brings between 10 and 20 meteors per hour under dark skies, radiating from the Orion constellation.

The waxing gibbous moon during the peak will add a fair bit of light pollution, but the moon will set between 03:12 am and 04:15 am depending on where in the States you're watching from, so you'll have a few hours before dawn to catch the darkest skies. You just need your eyes and clear, dark skies to see them, and a good astrophotography camera equipped with a wide-angle lens is perfect for capturing photos.

Taurids

Northern Taurids meteor shower above a row of trees

(Image credit: Getty Images)

The Taurids meteor shower comes in two parts. The first is the Southern Taurids, active between September 10 and November 20, peaking on the night of November 4-5 (during a thin waning crescent moon). The Northern Taurids come slightly later and are active between October 20 and December 10, peaking on November 12 (during an even smaller waxing crescent moon).

The hit rate is one of the lowest of all the meteor showers, with only around 5 meteors per hour. However, the Taurids are known for producing bright, slower-moving fireballs that linger in the sky — making them a particularly appealing astrophotography target.

Peak viewing time will be around midnight, when the Taurus constellation reaches its highest point in the sky.

Leonids

Leonid meteor shower above Lampang Thailand

(Image credit: Getty Images)

Radiating from the Leo constellation, the Leonids come from the dust and debris left behind by comet 55P/Tempel–Tuttle, which orbits the Sun every 33 years. They produce between 10 and 15 meteors per hour, and the shower period runs from November 6 to November 30, with the peak falling on the night of November 17-18.

The first quarter moon will set around midnight, making way for the best of the shower between midnight and 4 am in totally dark skies.

Star clusters and constellations

Pleiades (and Hyades)

Image of Pleiades, an open star cluster (also known as the Seven Sisters and Messier 45). There are a number of bright stars that stand out amongst the rest, surround by a faint dust cloud.

(Image credit: Giulio Ercolani / Alamy)

A favorite among many stargazers, the Pleiades (M45), an open cluster known as the "seven sisters" in the constellation of Taurus, slowly returns to the night sky this fall. By October, it rises in the east a couple of hours after sunset and is visible from dusk to dawn from November. Although it's about 440 light-years from Earth, you can see it with the naked eye under dark conditions — even though it's usually just a faint, fuzzy patch — but binoculars or a telescope provide a much more impressive view.

As Greek mythology has it, the sisters — named Maia, Alcyone, Asterope, Celaeno, Taygete, Electra and Merope — were the daughters of the Titan Atlas and Pleione. The story is that Zeus transformed them into a cluster of stars to escape the relentless pursuit of the giant hunter Orion, who fell in love with the sisters and chased them for seven years. It seems he couldn't take the hint.

Look below the Pleiades, and you'll find their five half-sisters, the Hyades — an open cluster which makes up the V-shaped face of Taurus, the Bull.

The Pleiades are a fantastic target to capture with a smart telescope. If you want to stack multiple sessions across fall and winter, start in late November when they're high in the sky. You want an altitude of 50 degrees or higher, and ideally 60 degrees or more. The cluster itself is easy to capture, but the less atmosphere you're looking through, the more you can pull out that delicate blue nebulosity, which is what takes an image of the Pleiades from good to spectacular.

Another enemy of that lovely blue glow is the moon, so make sure you're imaging under completely dark skies with no more than around 25% moonlight. If you get a clear, moonless night, aim for 2-3 hours minimum to capture the faint nebulosity, and go for 3-5 hours for a really impressive image.

Pegasus

Pegasus constellation

(Image credit: Getty Images)

The best time to see the Great Square of Pegasus is during the fall evenings between September and January, with October offering the clearest and highest views in the night sky.

This asterism is a large, prominent square shape made up of four bright stars in the eastern sky — Markab, Scheat, Algenib and Alpheratz — with the latter belonging to the neighboring constellation of Andromeda. The square is said to make up the body of the winged horse, and the four stars range from about 133 to 670 light-years away from Earth. Point a pair of binoculars at them, and they'll reveal many more stars that are not visible to the naked eye.

Cassiopeia

Cassiopeia constellation

(Image credit: Getty Images)

Cassiopeia is one of the Northern Hemisphere's circumpolar constellations, so although it's technically visible all year, it's best seen during the autumn and winter months. Throughout the fall, it climbs higher and higher in the sky, reaching its upper culmination in mid-November, when it is best viewed between 9 pm and midnight.

Depending on its rotation in the sky, Cassiopeia appears as a "W" or "M" shape made up of five bright stars ranging from 19 to 425 light-years away and visible with the naked eye.

Cassiopeia was a vain, arrogant queen in Greek mythology, and after boasting that she and her daughter, Andromeda, were more beautiful than the Nereids, the gods placed her in the sky tied to her throne, where she spends half of the year upside down as punishment for her vanity.

The Owl Cluster

owl cluster in the night sky

(Image credit: Stocktrek Images via Getty Images)

In addition to the constellation itself, there are some fun hidden objects within Cassiopeia that require binoculars or a telescope. The Owl Cluster (NGC 457) is a bright, open star cluster near the bottom-left star of the W shape, containing around 150 stars (although only 60 are identified as true cluster members), and is roughly 8,000 light-years from Earth. The blue and yellow "eyes" consist of the stars Phi Cassiopeiae (magnitude +5.0) and HD 7902 (magnitude +7.0).

You'll need a pair of astronomy binoculars to see it — go for 15x70 for a decent view, or 20x80 for an even better observation.

Caroline's Rose

NGC 7789 in a starry sky

(Image credit: Alan Dyer/StockTrek Via Getty Images)

Caroline's Rose (NGC 7789) is another open cluster in Cassiopeia, situated close to the last of the five bright stars in the "W" shape. Astronomer Caroline Herschel discovered the cluster in 1783 and it contains over 1,000 confirmed member stars, with estimates suggesting up to 3,000 potential stars.

It was named "Caroline's Rose" or the "White Rose" because its winding loops of stars and dark empty lanes resemble the petals of a cosmic rose, and it is estimated to be around 1.4 to 1.7 billion years old.

You can see it with a pair of binoculars under reasonably dark skies, but the best views will come from a telescope.

Deep-sky nebulas & galaxies

Andromeda galaxy

Andromeda Galaxy

(Image credit: Getty Images)

Our closest neighboring galaxy, Andromeda (M31), is about 2.5 million light-years from Earth and may one day collide with the Milky Way ("one day" being a 50/50 chance around 10 billion years from now, according to new research). But until then, we can easily make do with observing from afar with binoculars and telescopes.

October and November are prime evening viewing time, with the galaxy reaching its highest point between 7 pm and 11 pm. Under clear, dark skies, it's the most distant object visible to the naked eye, appearing as a very faint smudge — provided you know where to look. Binoculars provide a marginally better view of a somewhat larger, slightly brighter faint smudge — we've managed to see it with a pair of 8x25s under dark skies — but for the best views, you want a telescope.

It's a great first target for beginners using a smart telescope, with the prominent dust lanes revealing themselves after 30-60 minutes. If you want more detailed images of the faint outer arms, leave it for 3-4 hours. Moonlight can wash out the faint galactic arms and dust lanes, so if possible, choose a dark night with minimal light pollution.

In Greek mythology, Andromeda was the daughter of the aforementioned Cassiopeia. After angering the sea god Poseidon, Cassiopeia (who was not exactly Mother of the Year) chained Andromeda to a rock as a human sacrifice to the sea monster, Cetus, that Poseidon had sent to ravage their kingdom's coast. Andromeda was saved by Perseus, who she then married, and after her death, Athena placed her in the stars as a constellation.

Helix Nebula

An image of a rainbow-colored round nebula

(Image credit: NASA/CXC/SAO/Univ Mexico/S. Estrada-Dorado et al.; Ultraviolet: NASA/JPL; Optical: NASA/ESA/STScI (M. Meixner)/NRAO (T.A. Rector); Infrared: ESO/VISTA/J. Emerson; Image Processing: NASA/CXC/SAO/K. Arcand)

The Helix Nebula (NGC 7293) is a large planetary nebula around 650 light-years away in the constellation Aquarius. Often called the "Eye of God", it has a striking eye-like appearance, and it features thousands of comet-like radial filaments and complex gas rings.

It stays relatively low in the southern sky, with September being the best time to view or photograph before it gradually sinks over the coming months. Moonlight will completely wash out its faint outer gaseous ring, so it's best to shoot during a new moon (or when the moon hasn't yet risen) to get the best image possible.

The best hours to capture it are between about 10:30 am and 2 am, when it's either rising or at its highest. This should get you a pretty decent standard image, but if you want more detail, try to capture it over several nights to pull in the faint outer nebulosity and stack the images.

Triangulum Galaxy

Triangulum Galaxy

(Image credit: Getty Images)

The Triangulum Galaxy (M33) is the third-largest in our local group of galaxies, behind the Milky Way and Andromeda. This stunning spiral galaxy — not to be confused with the Pinwheel Galaxy (M101), which is best seen in the spring — sits in the small Triangulum constellation about 2.7 million light-years from Earth and is a great astrophotography target.

Its peak viewing time is October to December, when its highest and clearest position is after dark in the late evening. Because it's so faint, you need a moonless night away from light pollution. The sweet spot for smart telescopes is around 90 minutes, but if you can shoot for longer or want to split your shoot across multiple nights, 2.5 to 4+ hours can bring out more detail in the core and spiral arm.

Heart and Soul Nebula

heart and soul nebula

(Image credit: Getty Images)

The Heart and Soul Nebula is a nebula complex consisting of two massive emission nebulas located about 6,000 to 7,500 light-years from Earth in the constellation Cassiopeia. They are primarily made of glowing ionized hydrogen gas, darker cosmic dust lanes and trace amounts of ionized oxygen and sulfur.

Like most other nebulas, they aren't visible to the naked eye, so you'll need a telescope or a long-exposure astrophotography setup to see them. The Heart Nebula (IC 1805) is, unsurprisingly, named after its heart-like shape, while its neighbor, the Soul Nebula (IC 1848), has a more irregular shape with large cavities made by stellar winds.

If you're imaging the Heart and Soul with a camera or smart telescope, a total integration time of 6 to 12 hours will provide you with the cleanest details and most contrast in the faint gas structures. That said, 2 to 4 hours will give you a good basic stacked image.

As Cassiopeia is at its highest in the fall, this is the best time to see and photograph it with the least amount of atmospheric interference.

Ghost of Cassiopeia

ghost nebula

(Image credit: Getty Images)

The Ghost of Cassiopeia, often referred to as the Ghost Nebula (IC 63), is a mixed reflection and emission nebula around 550 light-years away in Cassiopeia. Its eerie red glow is caused by its proximity to the nearby blue giant star, Gamma Cassiopeiae, which sits right in the middle of the constellation's distinctive 'W' shape. The star’s powerful ultraviolet radiation causes the hydrogen to emit a soft red glow, while the surrounding dust reflects the star's light in fainter blue hues.

Like the other celestial sights in Cassiopeia, autumn and winter evenings are the best times to see and photograph it due to its high altitude in the sky. As the nebula is so faint and elusive to capture, you can only see it with a smart telescope or a long-exposure astrophotography setup.

When it comes to integration time, the longer the better. Aim for 3-5 hours minimum, ideally 6+ hours if the skies allow, and avoid shooting during moonlight if you can.

Celestron StarSense Explorer DX 130AZ review

12 September 2026 at 12:00

The Celestron StarSense Explorer DX 130AZ is a 5.1-inch (130mm) f/5 Newtonian reflector, one of many 130mm f/5 reflectors offered by Celestron. The DX 130AZ is also one of two 130mm StarSense Explorer variants, the other being a tabletop Dobsonian. The optical tube here rides on an alt-azimuth tripod instead and uses a 2-inch focuser, but otherwise, there are no major differences.

The DX 130 AZ is certainly one of the better telescopes in the StarSense Explorer series; there are also several decent Dobsonians, a pair of decent Schmidt-Cassegrains, the merely acceptable DX 102 refractor, a 114mm Bird-Jones model and some small refractors that aren’t of much use.

The DX 130AZ is definitely on the small end of what can be called a "serious" instrument, but even under a fairly light-polluted sky, it’s big enough to show you plenty of deep-sky objects and, of course, stunning detail on the moon and planets.

Celestron StarSense Explorer DX 130AZ review

Celestron StarSense Explorer DX 130AZ: Design

Celestron StarSense Explorer 130

(Image credit: Zane Landers)
  • 130mm f/5 Newtonian reflector with a parabolic primary and flat secondary mirror
  • Manual alt-azimuth mount and tripod with StarSense smartphone dock — no motors
  • Two 1.25” eyepieces included (25mm yielding 26x, 10mm yielding 65x)

The DX 130 rides on the same alt-azimuth mount/tripod shared with the other StarSense Explorer DX models. It’s reasonably sturdy, with one major caveat: you can’t actually point the DX 130 straight up. When aimed above about 70 to 75 degrees, the tube crashes into the mount or the tripod legs.

However, there is a simple workaround here. Deliberately set the tripod up unlevel, which lets you reach the zenith without affecting the mount or the StarSense system at all. It looks a little silly, but it works. The tripod is fairly stable as long as you’re not in a windy spot. Loading the accessory tray with sandbags or diving weights, or filling the hollow aluminum legs with sand or foam, helps considerably if you’re willing to do a bit of DIY work.

The mount has slow-motion controls with small gears for fine adjustments. They have a fair amount of play in them, but since this telescope is really only meant to be used up to about 200x magnification or so, it doesn’t matter much. In practice, the author barely used the slow-motion controls and simply nudged the scope by hand. For aiming the DX 130AZ, a red dot finder is provided in addition to the StarSense Explorer tech.

The StarSense Explorer DX 130 AZ comes with two eyepieces: a 25mm (26x) and a 10mm (65x). These are three-element eyepieces, likely Konigs or reversed Kellners. They work acceptably; the 25mm is a little blurry at the edges, and the 10mm shows some chromatic aberration toward the edge, but both are reasonably sharp. The bigger problem is that the housings are all plastic and there are a lot of internal reflections as a result.

Celestron StarSense Explorer 130

(Image credit: Zane Landers)

Better aftermarket eyepieces would be a wise investment, both for improved performance and a wider range of magnifications. We’d recommend a 6mm redline (108x), a 2x Barlow of some sort and a good wide-field eyepiece like the 24mm APM/StellaLyra UFF (27x), if you can afford it — the 6mm redline gets a bit closer than the provided 10mm eyepiece and offers a much sharper view, while the 24mm UFF is far crisper than the stock 25mm. With a Barlow lens and the 6mm, you can go up to 216x on the moon, planets and double stars — about the highest magnification this telescope can allow. Or you can choose your own eyepiece set to suit your needs.

Specifications

Optical design: Newtonian reflector
Mount type: Manual altitude-azimuth with StarSense smartphone dock
Aperture: 130mm (5.1 inches)
Focal length: 650mm
Focal ratio: f/5
Magnification: ~260x (highest useful)
Included eyepieces: 1.25” 25mm (26x) and 10mm (65x), 50 degree apparent field
Total kit weight: 18 pounds (8.16 kg)

The StarSense Explorer DX 130’s focuser is a 2.5-inch rack-and-pinion unit with a metal drawtube and plastic body. There’s some play in it, but it works acceptably well as long as you don’t overload it with too much weight. The focuser has adapters to accept both the provided 1.25” eyepieces as well as aftermarket wide-field 2-inch eyepieces, but at f/5, you really need a coma corrector of some sort to use the latter, which, along with the eyepieces themselves, will set you back quite a bit.

Being a Newtonian reflector, the DX 130 will usually need to be collimated for sharp images. Celestron doesn’t include a collimation tool, which is mildly annoying, but a basic collimation cap is cheap, easy to 3D-print, or can be improvised from a film canister. Overall, the DX 130 is lightweight and very portable, which is one of its real strengths — it’s easy to carry about, and the StarSense Explorer app will have no trouble plate-solving, even if you have to pick the scope up and carry it around the yard to avoid trees or other obstructions.

Celestron StarSense Explorer DX 130AZ: Performance

Celestron StarSense Explorer 130

(Image credit: Zane Landers)
  • Sharp, detailed lunar and planetary views
  • Excellent wide-field deep-sky performance from dark skies
  • Light and quick to reposition around obstructions

The DX 130 shows a great deal of detail on the moon, down to features a few kilometers across, and it’s genuinely sharp. The focuser is a little coarse, but with some finesse it will reach focus even at high magnifications. The 130mm f/5 optics can handle up to about 250x magnification on a night of steady atmospheric conditions, though the best lunar and planetary views are usually found somewhere between 150-220x and the mount starts to get wobbly as you push towards the higher end of that range.

On the planets, the DX 130 handles shadow transits of Jupiter’s moons easily, shows all four Galilean moons as disks and even reveals the Great Red Spot. Saturn’s rings are obvious, along with a smattering of a half-dozen moons, and the Cassini Division is visible when the rings are tilted more open than they are at present. Uranus is also visible as a tiny greenish disk, though its moons are not. It’s a struggle to distinguish Neptune from a star at all, but the StarSense Explorer app will help you identify which blue dot it is in a sea of similar looking 8th-magnitude points.

Celestron StarSense Explorer 130

(Image credit: Zane Landers)

One practical note: you do need to keep your phone screen dim and red while using this telescope with the StarSense Explorer app. The app has a red mode, but notifications, or your phone simply reverting to the lock screen, can flash the screen bright, and even at its dimmest a phone screen can affect your eyes’ dark adaptation quite a bit. But for most people this won’t be a serious problem if the screen is dimmed fully and used with a proper red filter — either a software solution or a physical red film.

As for deep-sky objects, the spiral arms of the Andromeda Galaxy and M33 look fantastic under a dark sky, though under light pollution only their cores are visible. Globular clusters such as M13 and M3 begin to resolve, while more difficult targets are harder going — M53 was tough from Bortle 5 but doable from Bortle 2 conditions. Under a bright sky, open clusters like M11, M35 and the Pleiades are the main deep-sky attractions with this telescope; under a dark sky, fainter nebulae and galaxies shine far better while the strands of dark nebulae and galactic cirrus begin to show up around open clusters.

The brightest planetary nebulae start to resolve with the DX 130 regardless of sky conditions. Most observers won’t see much color in them with this scope’s relatively small aperture — though some people pick out a bluish-green tint in objects like the Ring Nebula and the Cat’s Eye Nebula — but regardless, they’re reasonably easy to see even from light-polluted areas, especially with an aftermarket nebula filter.

Celestron StarSense Explorer DX 130AZ: Functionality

Celestron StarSense Explorer 130

(Image credit: Zane Landers)
  • StarSense app is optional
  • Quick and easy setup
  • Wide field of view forgives manual pointing errors

The StarSense Explorer DX 130 is, by design, a wide-field telescope, and one of its appeals is that you don’t strictly need any computerized pointing aids at all. The nice thing about the StarSense Explorer system is that it’s entirely optional — you can aim the telescope manually, with or without your phone docked, just like any other manual scope.

Set-up is quick: assemble the tripod and mount, attach the tube and an eyepiece, dock your phone, run the app’s alignment routine, and you’re observing. It’s much easier to get started with the StarSense Explorer than with a GoTo telescope, and you aren’t required to use it, either — for a quick gander at the moon or Jupiter for instance, there’s really no need to deal with the phone dock and app. With experience you might find yourself eventually not needing the StarSense Explorer tech at all, especially given the telescope’s wide field of view, which is quite forgiving of any manual pointing errors.

Should you buy the Celestron StarSense Explorer DX 130AZ?

Buy it if:

✅ You need a portable, tripod-mounted wide-field telescope.

✅ You want phone-guided pointing but also the option to aim manually.

✅ You frequently observe from sites with trees or obstructed horizons.

Don't buy it if:

❌ You want the most aperture and stability for your money.

❌ You want motorized pointing and tracking capabilities.

❌ You want to observe close-up details in galaxies and globular star clusters.

On the value for money front, you could get a 6-inch or even an 8-inch Dobsonian for the price of the DX 130 if you’re happy with a fully manual scope, or you could look at one of the other options below. The DX 130 is more portable than a full-size 6- or 8-inch Dobsonian and has a much wider field of view with any given eyepiece — but if you don’t have a fairly dark sky, that advantage is somewhat less valuable compared to those telescopes’ considerably larger aperture, which helps reveal more on targets less affected by light pollution.

A reflector like this gives much better views than the cheap refractors sold at this price and offers a much wider possible field of view than catadioptrics. The StarSense Explorer DX 102, effectively this scope’s sister model, has too much chromatic aberration to deliver sharp high-power images and doesn’t gather as much light as the 130. The StarSense Explorer 5-inch Schmidt-Cassegrain is decent optically and is admittedly a little more forgiving of cheap eyepieces thanks to its longer focal ratio, but it’s no better for planetary work than the DX 130 with proper eyepieces, can’t deliver a wide deep-sky field of view, and gathers slightly less light overall.

Overall, the DX 130 wouldn’t be the author’s top recommendation, but it’s certainly in the top 10 for the price range. If you’ve already decided this is the kind of telescope that you want, it’s a perfectly good choice; just consider the Dobsonians first if you want a manual telescope, or a fully automatic GoTo instrument if you want something more high-tech.

If this product isn't for you

Sky-Watcher Heritage 130P on a white backgroundFor the budget-conscious

Sky-Watcher Heritage 130P

The Sky-Watcher Heritage 130P uses the same optics as the StarSense DX 130 but is cheaper and more compact thanks to its collapsible tabletop Dobsonian design. The StarSense Explorer 130mm Dobsonian is another option — the same optics again, in a tabletop Dobsonian without the collapsible tube.

Celestron StarSense Explorer 8” on a white backgroundFor improved performance

Celestron StarSense Explorer 8-inch

A 6-inch f/8 Dobsonian like the Apertura AD6 or Sky-Watcher 6-inch Classic, or even one of the 8-inch models like Celestron’s own StarSense Explorer 8-inch, is much sturdier than the DX 130 or a tabletop scope/tripod, and offers easier collimation as well as higher performance with inexpensive eyepieces. However, they’re quite a bit bulkier and heavier than the DX 130 or a tabletop Dobsonian.

Celestron Astro Fi 130 on a white backgroundFor portability and ease of use

Celestron Astro Fi 130

If you want fully computerized pointing, Celestron’s Astro Fi 130 offers identical specs to the StarSense Explorer DX 130AZ but with full GoTo and tracking operated via your smartphone instead (and can be aimed straight up). However, set-up is much more time-consuming as you can’t simply put the telescope down and go.

Swarovski CL Companion compact binocular review

11 September 2026 at 12:00

The CL Companion is Swarovski's dedicated compact binocular, originally introduced 15 years ago, but has now been redesigned in 2026 to appeal to a wider, younger audience. RSPB research found an increase of around 1,000% in birdwatching among Gen Z in the UK since 2018, with a similar boom now happening in the US.

The CL Companion sits between the pocket-size CL Pocket and full-size EL and NL ranges, making it the perfect mid-range model that combines portability with excellent optical prowess.

The Companion is a grab-and-go, "take it anywhere and everywhere" binocular that is perfect for many different activities, whether that's spotting birds, scoping out your hiking trail or sweeping across the starry sky at night.

We spent a week with both the 8x30 and 10x30 CL Companions to test them out, with the former being ideal for tracking movement with a wider field of view, while the latter brings you closer to the details.

Swarovski CL Companion: Design

Swarovski CL Companion 8x30 in the hand
Swarovski CL Companion 8x30Kimberley Lane
Swarovski CL Companion 8x30 in the hand
Swarovski CL Companion 8x30Kimberley Lane
Swarovski CL Companion 8x30 in the hand
Swarovski CL Companion 8x30Kimberley Lane
Swarovski CL Companion 10x30 in the hand
Swarovski CL Companion 10x30Kimberley Lane
Swarovski CL Companion 10x30 in the hand
Swarovski CL Companion 10x30Kimberley Lane
Swarovski CL Companion 10x30 in the hand
Swarovski CL Companion 10x30Kimberley Lane
Swarovski CL Companion 10x30 in the hand
Swarovski CL Companion 10x30Kimberley Lane
  • Simple, fuss-free design
  • Rubber grip ensures a secure hold
  • Choice of three earth-tone colors

The biggest change in comparison to the old-style CL Companion is in the design. The original version was more of a traditional binocular aesthetic, but this updated design breathes life into the range with three new earth-toned colorways: mountain green, desert orange and safari brown. While some users have said they look somewhat toyish (or just downright ugly), when you handle them in person, they are much more sleek and stylish than the product images would have you believe.

Both the 8x30 and 10x30 weigh just 1.21 pounds (550 grams), so you can easily wear them around your neck all day without even knowing they're there. They're compact enough to put in a large jacket pocket, or you can just wear the included carry bag.

Key specifications

Magnification: 8x / 10x
Objective lens diameter: 30mm
Weight: 1.21 pounds (550 g)
Exit pupil: 3.8mm / 3mm
Field of view: 8-degrees / 6.6 degrees
Close focusing distance: 9.8 feet (3 m)

The central focus wheel has just the right amount of slip to make it easy to change focus, but is not so loose that you don't have enough control over it. The diopter is located on the front of the focus wheel, which felt a little off at first, but once we set it, there was no danger of accidentally changing it.

They also have generous eye relief, which is great news for users who wear glasses. The eye relief is 19mm on the 8x30 and 18mm on the 10x30. We used them on a bright, sunny day during a heatwave and were easily able to observe while wearing sunglasses with no issues at all.

Swarovski CL Companion: Performance

woman using the Swarovski CL Companion 8x30 by a river
Swarovski CL Companion 8x30Kimberley Lane
woman using the Swarovski CL Companion 8x30 by a river
Swarovski CL Companion 10x30Kimberley Lane
  • Sharp optics throughout the image circle
  • Minimal defects
  • Excellent for daytime birding

Out in the field, the CL Companions proved to be particularly well suited to daytime birding — although with 90% light transmission, they'll still hold their own at dawn or dusk. Both the 8x30 and 10x30 had a clear, sharp image, with plenty of detail across the image circle. The 8x30 felt particularly easy to use when trying to pick up birds quickly, while the 10x30's extra magnification was great for getting a closer look at more distant subjects.

The color reproduction was natural, and the views had good contrast without looking over-processed. Fine details on feathers were easy to pick out, even on smaller birds. There was a tiny sliver of color fringing towards the edges in high-contrast situations, but it didn't spoil the view whatsoever, and you'd only notice it if you were actively looking for it (which we were). Every time we have used a pair of Swarovski binoculars, there's a three-dimensional viewing experience and depth to the image that you just don't get with cheaper brands.

Both models performed well in the bright daylight conditions we were using them in, both in terms of optical clarity and comfort when using them for longer periods. Their small size and light weight meant we could comfortably track birds in flight without having to take breaks, which is often a dealbreaker when it comes to choosing a pair of birding binoculars.

Swarovski CL Companion: Functionality

Swarovski CL Companion 10x30 and bag on a rock
Swarovski CL Companion 10x30Kimberley Lane
Swarovski CL Companion 8x30 and bag on a rock
Swarovski CL Companion 8x30Kimberley Lane
  • Wide field of view for birding
  • Waterproof down to 13 ft/4 m
  • 3m close focusing distance

The wide field of view is one of the more useful features for birding. The 8x30 has a 549 ft (140m) FOV, while the 10x30 has 377 ft (115m) — both of which are wider than the original generation of CL Companion. Both made it easy to find birds when scanning trees and bushes, and there was enough space around the subject to follow them easily after they took flight.

The close focusing distance of 9.8 feet (3m) was also handy when birds came closer, and enables you to observe insects like bees and butterflies without spooking them by getting too close. And with the smooth focus wheel, it was easy to change focus between the two distances.

Both models are waterproof down to 13 feet (4 m), which is likely more protection than most people will need, but it is reassuring when using them outdoors in the rain, or if you were to accidentally drop them in a puddle.

Should you buy the Swarovski CL Companion?

On paper, they tick all the boxes. The optics are excellent, and they're lightweight and easy to carry. But with Swarovski being very upfront about the fact that it’s going after a younger audience with these CL Companions, we have to wonder what young person would have a spare $1,500 to spend on a pair of binoculars? It's not a small investment, so you'd need to be a dedicated observer to spend that kind of money.

That said, they're much more than your typical compact binoculars. They're a genuinely impressive binocular with stunning optics built into a small and compact package. Typically you need to compromise on one or the other, but the CL Companion gives you the best of both worlds.

If this product isn't for you

Swarovski NL Pure 8x42 on a white backgroundSomething more premium

Swarovski NL Pure 8x42

Dedicated birders who want a more premium option will want to look at the Swarovski NL Pure range. They're one of the best binoculars we've ever used, and you'd never have to buy another pair again. We tested the 8x32, but if you like to observe at dawn or dusk, the 8x42 would be ideal.

Read our full Swarovski NL Pure 8x32 review

Product photo of the Hawke Endurance ED 8x25Something more compact

Hawke Endurance ED 8x25

The Hawke Endurance ED 8x25 are tiny, pocket-sized compact binoculars with genuinely impressive optics. Our optics writer loved testing them so much she went out and bought herself a pair.

Read our full Hawke Endurance ED 8x25 review

Celestron SkyMaster Pro 20x80 on a white backgroundSomething better for stargazing

Celestron SkyMaster Pro 20x80

Dedicated stargazing needs a bigger objective lens diameter — we love the Celestron SkyMaster Pro 20x80, although you'll need to mount them on a tripod.

Read our full Celestron SkyMaster Pro 20x80 review

Canon RF 20mm f/1.4L VCM review: Wide, bright and built for the dark

10 September 2026 at 12:00

The Canon RF 20mm f/1.4L VCM is an intriguing lens for photographers who want a wide field of view without sacrificing aperture. Its f/1.4 maximum aperture makes it particularly appealing for astrophotography, while the 20mm focal length offers plenty of room for landscapes, architecture and other wide-view scenes.

We took the lens out to the dark skies of Wales to photograph the night sky and the Perseids, giving it a real-world test in some of the best conditions we could find.

With a premium L-series build and a price tag to match, there's a lot to consider before adding this lens to your kit. We wanted to find out how it actually performs in the real world, and whether it's worth the investment.

Canon RF 20mm f/1.4L VCM: Design

Canon RF 20mm f/1.4L VCM on a table

It's a nice size and weight, despite not being the smallest lens. (Image credit: Kimberley Lane)
  • Premium, solid build
  • Surprisingly manageable for an f/1.4 lens
  • A few small quirks keep it from being flawless

The Canon RF 20mm f/1.4L VCM feels like a proper L-series lens from the moment you pick it up. It's solid and reassuringly well-built, but it never felt excessively heavy or awkward on the camera. At 1.41 pounds (519 grams), it's certainly not a tiny 20mm prime, but the weight is well balanced and it was comfortable to carry and shoot with. And considering it'll often be used for astrophotography, it'll be on a tripod a lot of the time anyway.

The focus and control rings both feel smooth and nicely weighted, while the switches and customizable buttons are easy to find without having to look at the lens. The weather-resistant build is another bonus for outdoor shooting, which will come in handy if you also use the lens for landscapes where you might encounter inclement weather.

The dedicated aperture ring is also a nice feature, especially if you prefer having more physical controls rather than relying on the camera body and remembering which dial is set to each setting. Plus, the clickable nature of the aperture ring is an ASMR dream.

Canon RF 20mm f/1.4L VCM: Performance

milky way

The wide 20mm focal length and fast f/1.4 aperture are perfect for astrophotography. (Image credit: Kimberley Lane)
  • Excellent low-light performance
  • Sharp in the center with some corner softness
  • f/1.4 makes a real difference under dark skies

A fast 20mm is a pretty exciting combination for astrophotography. It gives us plenty of sky to play with, while the f/1.4 aperture pulls in a lot of light. Under those dark skies, the Milky Way came through beautifully, with plenty of detail without needing to resort to boosting the ISO too high.

We took the lens out to Carmarthenshire in Wales under Bortle 3 skies to photograph the night sky during the peak of the Perseids, which also coincided with the new moon — the perfect recipe for astrophotography.

The center of the frame is where this lens is at its best. Stars are crisp and well-defined, which is exactly what we want from a lens that is being used for astrophotography. The edges aren't quite as impressive, though. There is some softness and a little stretching of the stars towards the outer parts of the frame, particularly when the lens is wide open. It's not enough to ruin an image, but it becomes obvious when zooming in and pixel-peeping at the corners.

Canon RF 20mm f/1.4L VCM: Functionality

Canon RF 20mm f/1.4L VCM on a table
It's a very practical choice for everyday shooting.Kimberley Lane
Canon RF 20mm f/1.4L VCM on a table
Kimberley Lane
  • Quick and reliable autofocus performance
  • Customizable controls are genuinely useful
  • A practical choice for everyday shooting

The Canon RF 20mm f/1.4L VCM is very straightforward to use out in the field — especially in the dark. The autofocus was quick and reliable during testing, and for everyday shooting of landscapes, or even for video, this means there's very little to think about.

The customizable controls are useful, too. The lens function button and control ring can be assigned to different settings, allowing you to put the controls you use most within easy reach. It's a small thing, but being able to set the lens up around your personal shooting style makes it feel more intuitive and can save a surprising amount of time.

Key specifications:

Focal length: 20mm
Aperture: Constant f/1.4
Weight: 1.14 pounds (519 g)
Dimensions: 3 x 3.9 inches (76.5 x 99.3 mm)
Filter thread: 67 mm

The 67mm filter thread is another practical advantage, as it's a common filter size, so you won't necessarily need to invest in an entirely new set of filters if you already own that size.

The lens doesn't feature a ton of bells and whistles, but that's not a bad thing. It's designed to be picked up and used without much fuss, and after spending time with it, we found that its simplicity is one of its strengths.

Should you buy the Canon RF 20mm f/1.4L VCM?

The Canon RF 20mm f/1.4L VCM lens makes the most sense for photographers who regularly work in low light or want a dedicated wide-angle prime. Astrophotographers are likely to get the most from it, but it also has plenty to offer for landscapes, architecture, interiors and environmental photography.

Its biggest appeal over a zoom is its f/1.4 aperture. If you already have a wide-angle zoom but regularly find yourself having to bump up your ISO in low light, this lens fills that gap while also offering the control of a fast prime.

However, it's a fairly specialist addition to a lens lineup, and the price makes it tricky to justify if you only occasionally shoot wide. If you need the flexibility of changing focal lengths, or if you primarily shoot distant subjects, you'd be served better by a zoom or longer lens

If this lens isn't for you

Canon RF 16mm f/2.8 STM on a white backgroundCheaper option

Canon RF 16mm f/2.8 STM

The Canon RF 16mm f/2.8 STM is a much more affordable way into Canon's full-frame RF wide angle range, and it's much smaller and lighter. It lacks the 20mm f/1.4L's fast aperture, L-series glass and premium build, but if you're just starting out, or you only occasionally shoot wide, it could be a better option.

Canon RF 14mm f/1.4L VCM on a white backgroundIf you want to shoot wider

Canon RF 14mm f/1.4L VCM

If 20mm isn't wide enough, the Canon RF 14mm f/1.4L VCM gives a noticeably more expansive view while keeping the same fast f/1.4 aperture. It's a slightly more specialist choice for dedicated astrophotographers who want to capture as much sky or landscape as possible.

Canon RF 15-35mm F2.8 L is USM on a white backgroundIf you want more versatility

Canon RF 15-35mm F2.8L IS USM

If you don't want to be stuck with one focal length, the Canon 15-35mm f/2.8L IS USM is the obvious choice for astrophotographers. The focal range covers a much wider variety of photography styles, making it more practical for everyday shooting.

ZWO Seestar S50 Pro smart telescope review

1 September 2026 at 12:04

The ZWO Seestar S50 Pro was released on Aug. 25, 2026. It's a smart telescope that ships with everything you need to get started with astronomy and solar observations, eliminating the need to buy any other accessories.

It is controlled through the Seestar app on a smartphone and offers automatic slewing and autofocused views of galaxies, nebulas, star clusters and more. That said, in our experience, it sometimes needs manual adjustment with the on-screen joystick to perfect centering.

This being the Pro version of the original S50, which released three years prior, it's more expensive; you'll be paying $450 more than the original S50, with the S50 Pro coming in at $999. For that you get double the storage capacity (128 GB instead of 64 GB) and a higher resolution (4K not Full HD). ZWO claims the Pro has an extended battery life of nine hours, though we can't test this yet because the app version responsible for this uplift from the originally stated seven hours (version 3.3.1) wasn't released during testing.

So are these upgrades enough to warrant the extra spend?

ZWO Seestar S50 Pro review

ZWO Seestar S50 Pro: Design

ZWO Seestar S50 Pro on a tripod against a green shed
The Seestar S50 Pro comes in white with a compact mini carbon fiber tripod.Jase Parnell-Brookes
Someone pressing the power button on the ZWO Seestar S50 Pro
Only two buttons feature on the telescope itself, a large power button and a smaller reset button underneath.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green background
A dual lens system mirrors the S30 Pro's design and even has the same resolution.Jase Parnell-Brookes
  • Lightweight and easy to carry in the case provided
  • Dual-lens system mirrors the S30 Pro
  • Simple, two-button design and an easy push-on solar filter

The Seestar S50 Pro is instantly recognizable as a smart telescope. A neat, rounded and glossy plastic casing protects the fragile but automatic optical and electrical insides that power this pocket rocket. Only two buttons are found on the entire device: a large power button on the side enveloped by a ring of light that glows when powered on, and a small reset button on the bottom of the telescope.

Specifications

Image resolution: 8.3 MP (3840 x 2160)
Aperture: 50mm (1.96 inches)
Focal length: 260 mm
Storage: 128 GB internal
Field of view: 2.8 degrees (tele) / 63 degrees (wide)
Mount: Motorized alt-azimuth (EQ mode supported)
Battery: 9 hours (currently untested)
Weight: 6 pounds (2.72 kg)

The carry case that the S50 Pro ships in looks like black compressed polystyrene but has neat latches and a red handle that tucks away in a slot at the top, making it easy to pack — similar to a drone case. This is much better than some of the bags you can buy for smart telescopes as it feels more rigid and secure. The S50 Pro and its tripod and solar filter all ship together and are snugly held inside.

ZWO Seestar S50 Pro on a tripod against a green shed
Everything feels more polished and refined in the design of the S50 Pro, compared with the S30 Pro.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green shed
The carry case is cleverly designed and feels very protective with snug fit of the telescope and accessories inside.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green shed
Built into the case are two latches and a red handle that pushes into a groove to facilitate compact stowing.Jase Parnell-Brookes

It's light, too. We weighed it all, and the whole setup weighs 8.6 pounds (3.9 kilograms) fully packed, 6 pounds (2.7 kg) of that being the S50 Pro itself. It's also small; we measured it at 5.7 x 10.6 x 5.4 inches (146 x 270 x 138 mm), including the rubber feet on the bottom. Incidentally, we like that because it means you don't have to use the tripod if you don't want to.

We even received a bunch of ZWO-branded stickers that, if we were so inclined, we could pop on the telescope. But we're probably going to give them to the nephews.

ZWO Seestar S50 Pro on a tripod against a green shed
A 3/8-inch tripod thread on the bottom fits most photographic tripods, but a small carbon fiber tripod ships with it.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green shed
The carbon fiber tripod is light and locks in place with metal twist locks.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green shed
Rubber feet reduce vibrational interference and grip smooth, uneven surfaces without trouble.Jase Parnell-Brookes

Everything is controlled via the Seestar app, the same as all the other ZWO Seestar telescopes. This is typical for smart telescopes, which are almost always operated via an app.

As usual, and as we said in our S30 Pro review, it has a 3/8-inch tripod thread underneath, but the tripod itself is very small. We ended up using a larger photographic Gitzo carbon fiber tripod without the tripod head. But beware — if you're going to do this, take the tripod head off first. It won't fit the 1/4-inch thread of your standard mirrorless camera, which is likely what your tripod footplate will be.

ZWO Seestar S50 Pro: Performance

  • Aligns and tracks automatically
  • Live stacking reveals faint objects quickly
  • Solar eclipses can be shot as photo or video timelapses

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

Sunspots can be seen on the photosphere of the sun, and the push-on solar filter that ships with the telescope gives it a warm, orange hue. (Image credit: Jase Parnell-Brookes)

It took a matter of minutes for the live-stacking feature to give us clear and bright views of any object we slewed to. Live-stacking enables the smart telescope to take image after image to produce more detailed results of dim deep sky objects.

M27, the Dumbbell Nebula, was our standout favorite during testing, which we imaged over 10 minutes and 20 seconds. The final image captured the vibrant greenish blue core shining through, sandwiched by the red and orange glow of the nitrogen, hydrogen-alpha and sulfur.

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

Color and detail are impressive on the Dumbbell Nebula, but we wish it was larger in the frame. (Image credit: Jase Parnell-Brookes)

Other notable objects we observed included M31 (the Andromeda Galaxy), which had good shape and reasonable clarity over the nine-minute exposure and filled the frame nicely considering this is an 8.3 MP image. It's also possible to image M81 (Bode's Galaxy) and M82 (the Cigar Galaxy) together on the S50 Pro due to the wider field of view, and after only 6 minutes and 30 seconds' exposure time we saw clear arms on M81 and fragmented detail and deep coloring in M82 which we were pleased with.

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

Some spirals seen in M81 and detail seen in M82 in this seven-minute exposure. (Image credit: Jase Parnell-Brookes)

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

The Andromeda Galaxy really fills the frame when observing with the S50 Pro. (Image credit: Jase Parnell-Brookes)

We also observed the sun, both before, during and after the Aug. 12, 2026 solar eclipse. Sunspots were clearly visible on the S50 Pro, and the solar filter that ships with the S50 Pro as standard gives it a warm orange tone, which is pleasing, even if we couldn't see much other detail like granules or faculae. However, we wouldn't expect that with a smart telescope of this spec at this price point.

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

The start of the Aug. 12, 2026 solar eclipse was promising with crisp edges, sunspots and a warm orange tone with well-balanced exposure. (Image credit: Jase Parnell-Brookes)

Something that did frustrate us, though, was the S50 Pro's automatic exposure metering. This became most apparent during the Aug. 12, solar eclipse when taking a timelapse video.

The sun was overexposed most of the time, only allowing the darkest of sunspots to appear on the surface, but as the moon moved in front of the sun the exposure kept changing up and down, which it also did when clouds moved in front. The resulting timelapse was fun to share with friends and family over instant messaging but was far from ideal.

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

During the solar eclipse on Aug. 12, 2026 the metering of the telescope skewed and we were left with an overexposed sun. (Image credit: Jase Parnell-Brookes)

We also urge you to use a taller photographic tripod or similar when observing, due to our first session of nighttime imaging being obscured by a nearby tree bending into view during a long exposure, thanks to an occasional gust of wind.

Observational images of the night sky and the sun taken with the ZWO Seestar S50 Pro smart telescope

Due to the tripod being so short, sometimes trees bend into view with gusts of wind. Frustrating for long exposures. (Image credit: Jase Parnell-Brookes)

ZWO Seestar S50 Pro: Functionality

ZWO Seestar S50 Pro on a tripod against a green shed
The solar filter pushes on to the front of the lens assembly.Jase Parnell-Brookes
ZWO Seestar S50 Pro on a tripod against a green shed
The telescope as viewed without solar filtration.Jase Parnell-Brookes
  • Smartphone app is easy to use
  • A few niggles irk us, like typos and mislabelling
  • Zero-backlash motor purportedly reduces wind interference

Setting up the Seestar S50 Pro is easy, and if we hadn't run into some synchronization issues with the app, or if we had used the NFC (near-field communication) feature, it could have been up and running in around five minutes.

Things being as they were, though, we had to restart and reinstall the app once or twice, with the telescope not visible to connect with in the app. It took around 30 minutes total, which is no big deal for a first-time setup, but it's something to consider.

There were a few niggles that struck us as odd, considering ZWO's outstanding ability to produce high-end astronomy products. Namely, we experienced the Seestar S50 Pro naming the sun as the moon (it was a few hours before the solar eclipse and it's possible it got visually confused because of the solar filter). There was also a typo when checking if the sun is "in the fram."

Plus, when observing long exposures, ZWO's Seestar mascot clung to the side of the screen and couldn't be removed. These are nothing super major but are all things we would like to see addressed before spending $999.

Screenshots from the zwo seestar app on smartphone

A few quirks of the Seestar app have us wondering if this has been given a final once-over. (Image credit: Jase Parnell-Brookes)

Everything about the S50 Pro's functions is almost identical to the S30 Pro, which we reviewed in April 2026. Live-stacking of 10-second exposures reduces the signal-to-noise ratio and improves details over time. It automatically slews to and autofocuses on subjects. The S50 Pro also has plate-solving in order to orient itself on the stars of the night sky as most smart telescopes do. It has an equatorial mode for better subject tracking, and it's operated by the same Seestar app.

One big difference, however, is the S50 Pro's zero-backlash motor, which is used for tracking subjects. Compared with the S30 Pro's stepper motor, which is internally geared, the S50 Pro has more precise tracking and better resistance to wind movement. We saw clear and sharp images produced during testing, but there was minimal wind on the nights we tested, so further observations are required to confirm how much of a difference this really makes to the average user.

ZWO Seestar S50 Pro on a tripod against a green shed

The telescope fits snugly into the compact carry case. (Image credit: Jase Parnell-Brookes)

Should you buy the ZWO Seestar S50 Pro?

Buy it if:

✅ You need the extra light-gathering of the 50mm aperture

✅ You want a compact smart telescope that comes with a protective carry case and accessories

✅ You don't mind dropping nearly $1,000 on one device

Don't buy it if:

❌ You need something smaller and lighter

❌ Traditional observation is more appealing

❌ You want a budget smart telescope

If you don't have a smart telescope already and haven't tried any other ZWO smart telescopes, the S50 Pro is an easy win. It sits at the top of ZWO's smart telescope range, has the joint-largest aperture they offer, the joint-highest resolution and ships with everything you need to get started, even a solar filter for daytime observing. It's the best ZWO smart telescope currently available.

However, unless you have nearly $1,000 to spend on an instrument such as this, there are cheaper alternatives that do almost as well at a much lower price point. ZWO's own S30 Pro is $300 cheaper and bags a large amount of the same features and specifications as the S50 Pro. At nearly half the price, the S50 gives you the same aperture, but you will be restricted to much lower resolution.

If this product isn't for you

ZWO SeeStar S30 Pro on a white backgroundIf you want something cheaper

ZWO Seestar S30 Pro

Save $300 and grab the S30 Pro for the same resolution and most of the features but with a smaller 30mm aperture. You probably won't notice much difference between the two if you're an occasional backyard observer with limited technical interest.

Read our full ZWO Seestar S30 Pro review

dwarflab dwarf mini on a white backgroundIf you want something smaller

DwarfLab Dwarf Mini

It may only be 2 MP in resolution but it is far more compact. The DwarfLab Dwarf Mini is a darned sight more affordable, too. You could buy two or three for the price of one Seestar S50 Pro, depending what offers you can find.

Read our full Dwarflab Dwarf Mini review

Celestron Origin product image on a white background.If you want something bigger

Celestron Origin Intelligent Home Observatory

One for backyard use and special astronomy trips, the much larger and heavier Celestron Origin (a reflector) comes in just shy of the Seestar S50 Pro's resolution but can produce detailed 6.4 MP images. However, it has recently been superseded by Celestron's Origin II, which matches the 8.3 MP resolution of ZWO's telescope here, if you have the coin.

Read our full Celestron Origin review

Researchers harness sunlight to generate quantum entanglement

25 August 2026 at 09:00

As the world of quantum computing grows and researchers work towards scaling up quantum systems, energy consumption is becoming a major concern. Beyond the small scale and high level of control in a laboratory environment, the lasers that power quantum systems result in a large energy cost that may act as a bottleneck for the integration of quantum technology.

Publishing their findings in Optica, researchers have demonstrated that sunlight can be used to generate pairs of entangled photons, providing a more energy efficient alternative to laser-pumped systems. This collaborative project combined theoretical research led by Robert Boyd at the University of Ottawa with technology developed by Hanieh Fattahi’s research group at the Max Plank Institute for the Science of Light in Erlangen, Germany.

Overcoming assumptions

Optical quantum computers use pairs of entangled photons as qubits, with the nonlinear optical processes used to produce them typically relying on lasers. This is largely due to two assumptions: firstly, that high optical coherence is required, meaning that the light waves maintain a steady phase relationship; and secondly, that lasers are the only way to achieve the necessary optical power density for these methods.

Sunlight, while naturally abundant, is largely incoherent and is difficult to collect in concentrations comparable to that of lasers. As such, this natural reservoir of optical input has been largely overlooked as a direct resource for nonlinear optical processes.

The researchers behind this latest study are challenging these assumptions with a new system that uses sunlight to fuel a process called spontaneous parametric down-conversion (SPDC). In this process, a pump beam – usually a laser but replaced here with solar light – interacts with a nonlinear crystal, splitting individual photons into entangled pairs.

Previous work from Boyd’s team demonstrated that incoherent light from an LED can produce photons with entangled polarization states. By achieving entanglement powered by sunlight, this new research further overturns both assumptions about the necessary properties of the optical input.

Harnessing the Sun

To harness the plentiful yet highly dispersed sunlight, Fattahi’s team had to develop a device that focuses sunlight down to a point approximately 2 mm wide, to be coupled to a fibre as thin as a human hair. To achieve this, they used a Fresnel lens and spectral filter to collect sunlight, and a glass cone-shaped concentrator to funnel the light to a point, where it is coupled to the fibre. The fibre then directs the sunlight into the nonlinear crystal to induce SPDC.

Fattahi described the “significant practical challenges” involved with implementing such a system. Along with having to continuously track the Sun, the outdoor nature of the experiment left it vulnerable to both environmental effects and background light. Eventually compensated for by enclosing the system in a tent, the background light was initially offset by students beginning measurements at around 3 a.m. to make the most of the natural darkness.

Overcoming both theoretical and practical concerns, the system was able to successfully produce entangled photons. The states produced violate Bell’s inequality (as the photon correlations cannot be modelled classically) with an S value of 2.54, where S = 2 is the threshold for indication of quantum behaviour, and a 94% fidelity to the target entangled Bell state.

Significantly, when normalized in terms of the spectral bandwidth of the pump, sunlight-powered SPDC demonstrates a photon pair generation rate comparable to that of the laser-pumped process. This method eliminates the need for electrical-to-optical energy conversion, providing a viable path towards increasing energy efficiency.

The future of photon production

The development of quantum technology is vital for the future of secure communication, ultraprecise sensing and high-performance computation. Taking steps to develop a sunlight-driven method of photon pair production will potentially allow scaling of this technology without the major energy cost.

Minimizing energy consumption and system complexity would be a huge benefit for systems operating in demanding conditions, such as polar deserts. This research is particularly striking when considering space-based quantum technology. Sun-synchronous orbits could allow near constant access to a naturally occurring, reliable pump-source.

Fattahi and her team intend to develop a field-deployable version of this system, with a focus on greater integration which should “significantly improve mechanical stability, efficiency and overall practicality”. There is also potential to expand the portion of the solar spectrum used in this experiment. Fattahi described the “exciting possibility” of using different spectral regions to drive multichannel entangled-photon generation, increasing efficiency and capacity.

Research into new, energy-efficient photon production has the potential to remove a major barrier for the integration of quantum technologies and contribute to a brighter future for quantum computing.

The post Researchers harness sunlight to generate quantum entanglement appeared first on Physics World.

Baader AstroSolar Filter Film OD 5.0 review

10 August 2026 at 16:24

Baader AstroSolar Filter Film OD 5.0 is one of those "secret" astronomy products that looks almost too simple to be special. In its most familiar form, it’s a thin, silvery A3 or A4 sheet of metalized film that can be cut and mounted in cardboard, plastic or commercial filter cells. Surely it’s better to have a pre-made filter for your camera? Go to any solar eclipse, and you’ll get your answer: experienced eclipse photographers, solar observers and anyone wanting to safely point a camera or binoculars at the sun very often rely on Baader AstroSolar Filter Film OD 5.0.

Its popularity does not come from its ruggedness nor its out-of-the-box convenience. Whether bought as a loose sheet for making filters or as ready-made Baader solar filters for binoculars, camera lenses and telescopes, it enables super-sharp captures of sunspots on the sun, allowing much faster shutter speeds than some rival solar filter materials.

Although a brighter Baader AstroSolar Filter Film OD 3.8 Photo Film is also available (which is not designed for visual use), this review focuses on the Baader AstroSolar Filter Film OD 5.0, both as a practical DIY filter material and as the core of ready-made solar filters.

Baader AstroSolar Filter Film OD 5.0: Design

Baader AstroSolar Filter Film OD 5.0
Baader AstroSolar Film can be used to make solar filters for all kinds of equipment.Jamie Carter
Baader AstroSolar Filter Film OD 5.0
Baader AstroSolar Film can be used for all kinds of solar images.Jamie Carter
  • Thin and delicate
  • Perfect for crafting homemade solar filters
  • Available as A4 and A5 sheets and ready-made filters

The defining feature of Baader AstroSolar Filter Film is how little there is to it. The film is extremely thin — around 0.01 mm — and feels much more fragile than tougher solar polymer materials. That can be disconcerting the first time you handle it. It wrinkles easily, but should never be pulled tight. However, initial fears are misplaced because a good homemade solar filter does not require the film to be flat. In fact, it should be mounted slightly slack, because wrinkles and ripples in the filter material actually improve the image.

The real design advantage is that AstroSolar Film is hugely versatile and can be cut to suit almost anything. A single sheet can be used to make a front filter for a telephoto lens or two, as well as for a couple pairs of binoculars. Any filter must always go over the front of the optics, never behind them. For binoculars, make a filter for one objective lens for safe one-eyed viewing and securely cap the other.

Key specifications:

Product type: AstroSolar Safety Film OD 5.0 solar filter film
Material: Metalized film
Thickness: Around 0.01 mm
Light reduction: OD 5.0 blocks 99.999% of visible sunlight
Solar color: Neutral white
Formats: Loose sheets and pre-made filters

The film is sold as a loose sheet of material for DIY use in four sizes: ECO (140x155 mm/5.5x6 in), A4 (20x29 mm/8x12 in), 100x50mm/40x20 in, and Giant (117x117 mm/46x46 in). Also sold are the ASTF: AstroSolar Telescope Filter OD 5.0 (80-280mm), ASSF: AstroSolar Spotting Scope Filter OD 5.0 (50-150mm) and ASBF: AstroSolar Binocular Filter OD 5.0 (50-100mm). All come in multiple sizes.

They are, of course, neater and more durable than homemade cardboard versions, but the optical principle is exactly the same. Besides, the loose sheet version is more attractive if you have several lenses or binoculars to cover, or if you want to make a filter that precisely fits a specific lens hood.

Baader AstroSolar Filter Film OD 5.0: Performance

Baader AstroSolar Filter Film OD 5.0
An image of a partial solar eclipse in 2023, taken using a Baader filter.Jamie Carter
Baader AstroSolar Filter Film OD 5.0
AstroSolar Film gives the sun a neutral white appearance.Jamie Carter
  • Sharp solar detail
  • Neutral white color
  • Suits cameras and binoculars

Although its versatility makes it unusual, making DIY solar filters won’t be for everyone. However, the main reason to choose Baader AstroSolar Filter Film is for its image quality. When used correctly, it produces a sharp, high-contrast, white-light view of the sun. Sunspots appear cleanly defined, the solar limb looks crisp and the image has a neutral white tone, rather than the deep orange produced by some polymer filters.

That white rendering will not be to everyone’s taste. Casual eclipse watchers often expect the sun to look orange through solar filters because that is how it often appears through eclipse glasses and some glass or polymer solar filters. Baader’s version is a lot more clinical. For photographers, however, that is an advantage. A neutral white solar disk is easy to warm up later in editing, while a heavily colored orange image gives a little less flexibility. It all depends on your point of view.

The sharpness advantage comes from the fact that it allows shorter exposures, something that becomes more obvious as the focal length increases. In a short-lens or wide-field composition, the sun is small, so differences between filter materials are less obvious.

On a 400mm, 500mm or 600mm lens, where sunspots and the edge of the solar disk matter more, Baader AstroSolar Film OD 5.0 shows why it has such a strong reputation among eclipse photographers. In our tests at 400m set to f/8 and ISO 100, we found that exposures of 1/800s and 1/1,000s achieved the best results.

Baader AstroSolar Filter Film OD 5.0
An image of the sun using 1/2,000s exposure. Jamie Carter
Baader AstroSolar Filter Film OD 5.0
An image of the sun using 1/1,000s exposure. Jamie Carter
Baader AstroSolar Filter Film OD 5.0
An image of the sun using 1/800s exposure. Jamie Carter
Baader AstroSolar Filter Film OD 5.0
An image of the sun using 1/250s exposure. Jamie Carter

It also works well with binoculars. In fact, we’ve been traveling to watch solar eclipses using the same DIY solar filter fashioned from Baader AstroSolar Film OD 5.0 for a decade. Over the years, it’s been reinforced with plastic tape to extend its lifespan. It turns a pair of 10x50 binoculars into a safe solar-viewing instrument for the partial phases of an eclipse (just remember to cap the non-filtered lens).

The use of Baader AstroSolar Film is, of course, solely for capturing the partial phases of a solar eclipse, allowing safe imaging of the shrinking solar crescent. If you’re in the path of totality and about to watch a total solar eclipse, you’ll need to gently remove the filter when it gets dark.

That makes a homemade slip-on filter particularly attractive: it can be designed to slide off quickly, avoiding the fiddly delay of unscrewing a hot, threaded plastic or metal filter during the brief moments of totality. It’s wise to have an empty shirt pocket ready to take that filter for the few minutes of totality, which will keep it safe until the post-totality partial phases a few minutes later.

Baader AstroSolar Filter Film OD 5.0: Functionality

Baader AstroSolar Filter Film OD 5.0
Homemade filters can be built from the A3 or A4 sheets of AstroSolar film.Jamie Carter
Baader AstroSolar Filter Film OD 5.0
Ready-made Baader solar filters use the same core AstroSolar material.Jamie Carter
  • Easy to use for DIY projects
  • Works across many optical devices
  • Safety checks required

If you buy a solar filter that uses Baader AstroSolar Filter Film OD 5.0, you have an excellent product that requires care when traveling and storing. If you purchase it as a sheet of material, it requires some time and patience as well as cardboard, tape, glue and scissors to custom-build your own Baader AstroSolar Solar Filter for almost any optical device. That’s a huge advantage over many screw-in photographic filters, which only fit specific thread sizes.

As you’d expect, making a new solar filter for any new gear from an existing sheet of Baader AstroSolar Filter Film is much cheaper than investing in an all-new screw-in photographic filter.

The DIY construction is simple: two cardboard rings sandwich the film, then a short cardboard sleeve fits snugly over the lens hood, binocular objective or telescope tube. The result should be secure enough that it cannot fall off accidentally, but easy enough to remove deliberately. It’s a good idea to have some masking tape handy in your camera bag for added security, particularly if it’s windy and/or the sun is low on the horizon.

Whether your solar filter is pre-made or homemade, it’s important to inspect it before use, especially when using Baader AstroSolar Filter Film. Any holes, tears, or scratches are reasons to stop using the filter.

Should you buy Baader AstroSolar Filter Film?

Buy it if:

✅ You want to make your own solar filters.

✅ You need filters for camera lenses and binoculars.

✅ You want sharp, white-light solar images.

Don't buy it if:

❌ You want the simplest possible eclipse-viewing option.

❌ You don’t have the patience to craft your own solar filter.

❌ You prefer an orange solar image.

Baader AstroSolar Filter Film OD 5.0 is neither the most robust nor the quickest solution for casual eclipse viewing. Its delicate construction demands careful handling, storage and inspection before every use. For some users, a ready-made polymer or glass filter will be less stressful.

However, for photographers and binocular users, it’s hard to beat. It is light, sharp, adaptable and available in various forms for different solar imaging needs. Its greatest strength is that it allows you to create exactly the filter you need, whether that’s for a 400mm camera lens, one side of a pair of binoculars, a compact travel telescope or any other equipment.

Treat it gently and mount it securely, and Baader AstroSolar Filter Film remains one of the most useful solar filter materials available.

Where to buy last-minute solar eclipse glasses and viewing gear before August 12

7 August 2026 at 14:35

Even though August 12's solar eclipse won't be much to look at for observers in the U.S., it'll be even less impressive if you can't look at it at all. In order to see the partial phases, you MUST wear a pair of certified solar glasses or solar binoculars to view the sun safely.

The American Astronomical Society states, "ISO 12312-2 specifies the properties that a solar viewer should have in order to protect your eyes from injury and provide a comfortable view."

With the eclipse fast approaching, there is still time to pick up some last-minute solar viewing equipment, but some retailers are already selling out and won't be able to deliver before Wednesday, August 12.

Here are the best options you can still get hold of before the solar eclipse.

This 5-pack of solar eclipse glasses from Lunt is ideal for viewing parties, for the whole family to use or just to have spare pairs for future eclipses.

They're ISO 12312-2 certified and Prime members can get them on free next-day delivery.View Deal

This 2-pack of solar glasses from Soluna is super affordable, ISO 12312-2 certified and is even available for same-day delivery in some areas.View Deal

The Celestron EclipSmart 12x50 solar binoculars provide safe solar viewing with 12x magnification, and Prime members still have time to have them delivered before August 12.

But there's a rather large caveat here. Buying them mere days before a solar eclipse is arguably the worst possible time to purchase them, as this is when they're most expensive. For example, last October, they went down to $26.82. (Ah, capitalism).

So unless you plan on observing the sun all-year round, perhaps stick to the solar glasses for now and buy them in a few months when they're cheap so you're ready for the next one.View Deal

If you don't want to pay the inflated price for the solar binoculars, or you already have a pair of binoculars, these DayStar filters are a great option that fit on the front of the objective lenses to protect both your eyes and the lenses.

They come in various sizes, although they aren't suitable for objective lenses under 50mm.

While BHPhoto doesn't give exact shipping dates, you could still get them before the eclipse.View Deal

For the tech-nerds who want to take photos or a time-lapse of the eclipse, the Dwarf Mini is an affordable and portable smart telescope that comes with a solar filter and provides effortless solar imaging.

It was cheaper at the beginning of July, but it's still a great investment that you can use day and night all year round, so we wouldn't let the higher price put you off. Plus, it's still much more affordable than most, if not all, other smart telescopes.

Prime members can get same-day delivery (depending on location).

Read our full Dwarf Mini reviewView Deal

Now feels like the right time to grab a smart telescope, we reckon you can't get better than the ZWO SeeStar S30 Pro, and the included solar filter is ideal for capturing images or time-lapses of the eclipse. Plus, it produces absolutely stunning astro-images, too.

You can still get it before August 12 from BHPhoto, but we wouldn't wait too much longer.View Deal

Quantum Photons Survive a 24-Kilometer Journey Through Chicago’s Busy Internet

1 August 2026 at 23:24
Data Security Quantum Internet InformationResearchers achieved the first real-world demonstration of quantum entanglement over a busy telecommunications fiber network. A single photon carrying quantum information had to travel more than 24 kilometers through an optical fiber already crowded with powerful internet signals. Despite the noise, it reached downtown Chicago still entangled with its partner at Northwestern University’s Evanston campus. [...]

How to build the perfect solar eclipse kit for any budget

30 July 2026 at 12:00

One of the biggest misconceptions about solar eclipses is that enjoying them requires expensive solar gear. Telescopes, tracking mounts, cameras, telephoto lenses and solar filters are all part of the kitbag for serious eclipse photographers, but the reality is that many travel with surprisingly little equipment.

That will be especially true on Aug. 12, 2026. The total solar eclipse crossing Greenland, Iceland and Spain is the headline attraction that day — closely followed by a partial solar eclipse across Europe and in Canada and the U.S. Northeast — but it won't be the only celestial event worth seeing. Just hours later, the Perseid meteor shower reaches its peak beneath moonless skies. So any eclipse kit built for the Aug. 12 eclipse should therefore be designed with one eye on a night-shoot capturing "shooting stars."

Here's what to buy for your eclipse-meets-Perseids double-header, according to your budget.

Under $50: Keep it simple

two women looking at the sun wearing solar eclipse glasses

Solar eclipse glasses should be your first investment. (Image credit: Getty Images)

If your budget is less than $50, the good news is that you're not excluded from the eclipse experience. In fact, you can assemble everything necessary for a memorable eclipse day without spending very much at all.

The first purchase should always be certified eclipse glasses. Find some safe suppliers that meet the ISO 12312-2 standard for solar viewers, and consider buying more than you need (somebody nearby will almost certainly forget theirs). A handheld solar viewer is a worthwhile alternative, offering a slightly larger and often more comfortable view than eclipse glasses alone.

With the remaining budget, I'd focus less on astronomy equipment and more on practicality. A compact power bank and a reclining lawn chair (handy for the eclipse and the Perseids) could all be within your budget. Eclipse day involves a great deal of waiting, but if you're standing in the path of totality — or primed to see a partial eclipse — eclipse glasses and a clear sky are all you really need to experience something extraordinary.

Under $200: The biggest upgrade you can make

Binoculars widened to show interpupillary distance

A pair of solar binoculars is a fabulous upgrade if you’re observing only a partial solar eclipse. (Image credit: Jason Parnell-Brookes)

Once your budget reaches around $200, I'd start thinking about binoculars. For many people, the single best upgrade is a pair of dedicated solar binoculars. You can get mini pairs, such as the Celestron EclipSmart 10x25 and Lunt 6x30 Mini Sunoculars, or more substantial pairs like the Celestron Eclipsmart 10x42 and Celestron EclipSmart 20x50. We've tried them all, and can tell you that the Lunt 8x32 SUNoculars are the best (and easiest to find the sun with, which beginners always find is surprisingly small in the sky).

Unlike eclipse glasses, which show the sun as a small orange or white disk, solar binoculars reveal sunspots and make the moon's gradual progress across the solar surface much more engaging. They offer far more detail without introducing the complexity of a telescope. These are the best upgrades you can make if you're not in the path of totality and want to maximize your view of the partial phases of the eclipse.

If you're in the path of totality awaiting a total solar eclipse, forgo the solar binoculars and get yourself a good pair of conventional binoculars. The reason is simple: the partial eclipse will be interesting to watch through your eclipse glasses, but it's the totally eclipsed sun — and the beautiful solar corona that's revealed when it gets dark — which is the star attraction. You can safely see it with the naked eye or through conventional binoculars (but ONLY when the entire disk of the sun is blocked during totality, which will be for a minute or two).

A good choice would be a pair of 10x42 or 10x50, not only because you'll get a great view of the solar corona and prominences — loops of plasma from the sun's surface — but because they'll double as excellent stargazing binoculars for sweeping across the Milky Way's rich star fields, bright clusters and countless stars when it gets dark. Using products like DayStar Filters and Baader AstroSolar Safety Film ND 5.0, you can make any pair of conventional binoculars into temporary solar binoculars (use a solar filter for one lens and cap the other).

Under $500: Enter the smart telescope

sun taken with the dwarflab mini

Smart telescopes will enable easy images of a solar eclipse. (Image credit: Jamie Carter)

At around $500, a completely different category of equipment becomes available. If we were building an eclipse kit from scratch, this is probably the budget level that would tempt us most because it opens the door to smart telescopes. Devices such as the Seestar S30 and Seestar S30 Pro (as well as the upcoming Seestar S30 Pro Eclipse Edition), DwarfLab Dwarf Mini and Vaonis Vespera Pro are portable and can automatically track the sun. All either have solar filters in the box, or their makers sell them separately (or you can make your own — see above).

The appeal of a smart telescope is that it can track the sun and photograph the eclipse while demanding relatively little attention from the user. With a solar filter fitted, a smart telescope can safely image the partial phases. For those in the path of totality, the totally eclipsed sun can also be imaged — just remember to take the solar filter off, and put it back on again when totality ends. You can then switch to capturing deep-sky objects at night, something you can do without much fuss while you watch the Perseid meteor shower peak with your naked eyes (the only way).

Over $1,000: Getting a close-up

a group of photographers with cameras on the beach

Cameras and telescopes will get you a close-up of the eclipse. (Image credit: Jamie Carter)

Once you move beyond the $1,000 mark, your options are myriad. Personally, we would go straight for some image-stabilized binoculars. Models such as the Canon 10x42L IS WP, Canon 15x50 IS All Weather or Canon 12x36 IS III are among the most impressive astronomical instruments available to eclipse chasers because they combine premium optics with stabilization technology that effectively removes hand shake.

When you're standing in the path of totality looking at the sun's corona in close-up, image stabilization is absolutely what you want. If you chase solar eclipses every few years, they're worth buying for the few minutes of totality you get to experience. For the partial phases, we use a homemade solar filter on one lens and cap the other lens. Alongside those binoculars, we'd be tempted by a smart telescope for getting basic, but impressive images.

If you like a challenge, you could, of course, go straight for manual photography. Get a mirrorless or DSLR camera and a zoom lens, and you can have a go at imaging the solar corona yourself. You could also consider pairing a camera with a telescope and a star (or solar) tracking mount that can automatically track the sun. You'll also need to add a quality tripod and solar filters. If you fancy imaging the Perseid meteor shower later that night — or for any landscape astrophotography and the Milky Way — you'll also need a wide-angle lens.

Research, rehearse, prepare

The danger at this budget level is believing that more equipment automatically produces a better experience. It doesn't. Every eclipse attracts photographers and observers carrying thousands of dollars' worth of gear, but many — typically first-timers — spend totality worrying about camera settings instead of looking at the sky.

Whatever gear you buy, the best investment is always time — time to research, rehearse and prepare, and also to arrive early enough to settle into your observing location. That applies to whatever kind of solar eclipse you're in line for.

Whether your budget is $50 or $5,000, the perfect eclipse kit is the one that allows you to experience a solar eclipse — and if that includes totality, know that it will be a priceless experience.

Which solar eclipse viewing method is right for you?

29 July 2026 at 12:00

The total solar eclipse on Aug. 12, 2026, will attract millions of viewers across northern Spain, western Iceland and eastern Greenland, while a deep partial eclipse will be visible across much of Europe, and a smaller partial eclipse will reach parts of northeastern North America.

If you're planning to watch, one question matters more than almost any other: how are you going to observe it safely?

The answer depends on where you are, your budget and what kind of experience you're after. Some people want to simply look up and enjoy the spectacle. Others want to study sunspots, photograph the eclipse or capture loved ones gazing at the eclipsed sun. Many away from the path will stay at home and livestream it. There is no correct way to watch a solar eclipse, but it's important to stay safe. Here are eight ways to safely view the Aug. 12, 2026, solar eclipse.

1. Eclipse glasses for viewing from land

four people watching an eclipse with solar glasses

Eclipse glasses are the easiest and safest way to view the partial phases. (Image credit: Getty Images)

If you're planning to watch any part of the eclipse with your own eyes, eclipse glasses should be your first purchase. Certified eclipse glasses that comply with the ISO 12312-2 standard block more than 99.999% of sunlight, making it safe to look directly at the sun during the partial phases.

Without them, even a brief glance at the uneclipsed or partially eclipsed sun can cause permanent eye damage. Through them, the sun appears as either a bright orange or a whitish disk against a black background. As the moon gradually moves across it, the changing crescent shape becomes immediately obvious. During the final minutes before totality, the solar crescent shrinks to an impossibly thin sliver.

For observers in Britain, Europe and North America outside the path of totality, eclipse glasses are arguably all you need. The entire eclipse remains partial, so the glasses stay on from beginning to end. Even if you're traveling to Iceland, Greenland or Spain for totality, eclipse glasses remain essential throughout the partial phases before and after totality, when the sun is still dangerously bright.

However, you should buy them early. Before every major eclipse, supplies tighten and some retailers sell out entirely. For reputable sellers, check out the American Astronomical Society's list of safe products. Recommended manufacturers include American Paper Optics, Rainbow Symphony and Thousand Oaks in the U.S. and Baader in Europe.

2. Handheld solar viewers for cruise ships

people using handheld solar viewers on a cruise ship

Solar eclipse viewers can be secured using a lanyard. (Image credit: Jamie Carter)

Many eclipse chasers prefer handheld solar viewers to eclipse glasses. These use the same safe solar-filter material and are made by the same manufacturers, but provide a larger viewing window. They typically hang around your neck on a lanyard, which makes them essential if you want to observe an eclipse from a cruise ship — it stops them from blowing into the sea. The actual view is almost identical to what you'll see through eclipse glasses.

3. Totality with the naked eye

an adult and two children looking at the total solar eclipse

If you are in the path of totality, you can look at the totally eclipsed sun with the naked eye. (Image credit: Getty Images)

If you're fortunate enough to observe from within the path of totality, there is one viewing method that rules all others during totality only — the naked eye. Although you must never look at the sun without eclipse glasses during the partial phases, during totality it's not only perfectly safe, but also the only sane thing to do.

During totality, you MUST take your eclipse glasses off to see the solar corona — one of nature's most extraordinary sights. The naked eye will also help you find bright planets around the eclipsed sun and the horizon glowing with twilight colors in every direction. If this is your first total solar eclipse, make a promise to yourself beforehand: spend at least some of totality doing nothing except looking up.

4. Solar binoculars

Binoculars widened to show interpupillary distance

Solar binoculars are an easy way to get a close-up of the partial eclipse. (Image credit: Jason Parnell-Brookes)

If observing the eclipsed sun through eclipse glasses and solar viewers leaves you unimpressed, you can upgrade your experience by opting for dedicated solar binoculars, which have permanently attached solar filters. They offer a significant jump in detail over eclipse glasses without introducing the complexity of a telescope. Sunspots become obvious, and you can more easily see them get covered by the advancing edge of the moon.

All kinds of magnifications are offered, but 10x42 is about the limit. Any more and they not only become hard to hold steady, but the eclipse then gets more difficult to find in the sky.

Since you can't use them during totality, solar binoculars are best seen as a good upgrade for observers outside the path of totality.

5. Regular binoculars

Jase Parnell-Brookes using binoculars

Solar filters can be added to any pair of binoculars for viewing the partial phases. (Image credit: Kimberley Lane)

Normal binoculars are arguably a better choice if you plan to be within the path of totality. This is what experienced eclipse watchers do, and with good reason — they simply add solar filters for the partial phases, then remove them during totality for a close-up of the solar corona.

For the partial phases, solar filters must completely cover the front objective lenses. Never place filters over the eyepieces and never rely on improvised materials such as sunglasses, smoked glass or photographic filters — you must use dedicated solar eclipse filters.

However, since objective lenses come in all shapes and sizes, it's often easier to make your own solar filters using Baader AstroSolar Film. Typically, users will make a solar filter for one lens and cap the other, removing both during totality.

Image-stabilized binoculars deserve special mention. Models from Canon and other manufacturers can provide remarkably steady views of the eclipse without requiring a tripod, making them particularly attractive for travel.

6. Telescopes

solar filter attached to a telescope

Telescopes can be used during the eclipse, as long as they are equipped with a solar filter for the partial phases. (Image credit: Getty Images)

The same applies to telescopes as applies to binoculars — you can buy a solar telescope with a permanently attached solar filter, or (a more popular method) put a solar filter on any telescope. However, there is another unusual option here — a dedicated hydrogen-alpha solar telescope, which reveals an entirely different side of the sun.

Rather than showing the photosphere, they isolate light emitted by hydrogen atoms in the chromosphere and show prominences arching above the solar limb as well as dark filaments across the disk. The downside is that hydrogen-alpha instruments are among the most specialized and expensive telescopes in amateur astronomy.

7. Smart telescopes

dwarf mini against some greenery

A smart telescope can take images automatically during the eclipse. (Image credit: Jamie Carter)

Few areas of amateur astronomy have changed as rapidly as smart telescopes. Devices such as the Unistellar Odyssey Pro, ZWO Seestar S30, DwarfLab Dwarf Mini and Celestron Origin have introduced a new generation of observers to astronomy by automating much of the traditional setup and operation.

For eclipse observing, the appeal is obvious. Once fitted with a solar filter, these systems can automatically track the sun, display images on a smartphone or tablet and save photographs with minimal fuss.

For eclipse travelers heading to Iceland, Greenland or Spain, smart telescopes can also reduce some of the stress associated with eclipse photography. Many users plan to have the telescope automatically capture the eclipse during the partial phases, then simply enjoy totality with their own eyes. Just don't spend the entire eclipse staring at a smartphone!

8. Livestreams

total solar eclipse livestream schedule

(Image credit: Time And Date)

What if you can't travel? Or if it's cloudy? The Aug. 12, 2026, eclipse will be streamed by observatories, astronomy organizations and media outlets around the world. A livestream can never replace standing beneath the moon's shadow, but it guarantees you'll see totality even if clouds intervene.

Confirmed live streams so far include the total solar eclipse by TimeAndDate and the European Space Agency, while partial solar eclipse images will come from the Royal Observatory in Greenwich, London, U.K. When cell signal allows, some eclipse observers keep a livestream running on a nearby phone while observing the real eclipse overhead, and/or livestream views from their own telescope on social media.

What's the best way to look at the eclipse?

The best viewing method for a solar eclipse depends entirely on what you want to get from it. Just remember that the purpose of the technology is to support the experience, not replace it — no instrument can replace the experience of seeing the solar corona with your own eyes if you're within the path of totality. Choose the viewing method that helps you do that — and spend as much time as possible simply looking up.

The ultimate packing list for Aug. 12, as a solar eclipse coincides with the Perseid meteors peak

28 July 2026 at 12:00

Aug. 12, 2026, promises to be a big day for anyone interested in the sky. By day, a solar eclipse will be visible across parts of North America and Europe. For most, it will be partial, but for those within the path of totality in eastern Greenland, western Iceland and northern Spain, the moon will completely block the sun.

Hours later, the sky show continues with the peak of the Perseid meteor shower on the night of Aug. 12-13. The shower occurs when Earth passes through debris left behind by Comet 109P/Swift-Tuttle, producing bright meteors and occasional fireballs. In 2026, the timing could hardly be better. The same new moon that makes the solar eclipse possible will also create moonless skies for meteor-watching, with observers under dark skies potentially seeing 30 to 50 "shooting stars" per hour.

All of that happens after the eclipse. As a bonus, Venus will blaze low in the west during twilight, the Milky Way will stretch overhead after dark and, in Iceland, there is even a slim possibility of an early-season aurora display. Many visitors will spend 12 hours or more outdoors, arriving long before first contact and remaining under the stars until after midnight. Here’s what to consider buying for this very special day and night beneath the sky.

Nothing belongs in your bag more than certified eclipse glasses. Whether you're in Spain's path of totality, watching a deep partial eclipse from the U.K. or viewing a smaller partial eclipse from North America, proper eye protection is essential during every partial phase of the eclipse. Even observers inside the path of totality will spend far longer watching the eclipse before and after totality than during it.

Eclipse glasses should comply with ISO 12312-2 and be bought from a reputable supplier. These Eclipser HD glasses from American Paper Optics are more comfortable and harder-wearing than regular cardboard products.

Read: Best solar eclipse glassesView Deal

Dedicated solar binoculars like the Celestron EclipSmart 10x42 are one of the best eclipse purchases you can make. They reveal sunspots, active regions and the changing shape of the partial eclipse in a way eclipse glasses simply cannot.

They're lightweight, require no set-up and provide a far more immersive view of the partial phases. However, it's important to practice with them before the eclipse because finding the sun is not as easy as many think. The EclipSmart porro solar binoculars also come in 12x50 and 20x50 versions.

Read: Celestron EclipSmart 10x42 solar binoculars reviewView Deal

Although solar binoculars are great for the partial phases, you can just make some regular optical binoculars safe by using Baader AstroSolar Safety Film OD 5.0 to make your own filters. However, if you’re heading to the path of totality, consider getting some image-stabilized binoculars to allow you a spectacular close-up of the solar corona.

These reference-level binoculars from Canon use motion sensors to detect hand shake and then shift actuators around the lenses to cancel it out. Other image-stabilized options include the Canon 12x36 IS, Canon 8x20 IS and Canon 15x50 IS.

Read: Canon 18x50 IS UD all-weather binoculars reviewView Deal

If you want to explore the world of solar observing during the eclipse and well beyond, consider investing in a hydrogen-alpha solar telescope. Isolating light emitted by hydrogen atoms in the chromosphere, they show you an entirely different view of the sun — from sunspots and dark filaments to prominences and, if you’re really lucky, a solar flare in action.

This 40mm aperture and 400mm focal length option from Lunt makes it thoroughly portable.

Read: Best telescopesView Deal

Solar eclipse glasses work well for individual viewing, but if you want a safe way to share an image of the partially eclipsed sun, consider a solar projector. The Solar Projector arrives flatpacked and is made entirely of stiff cardboard (which doesn’t heat up like metal or melt like plastic).

Once aimed at the sun using a designed-in quadrant to measure the sun’s declination, it uses its achromatic glass lens and convex mirrors to create a 55-75mm image of the sun on a small screen.

Read: Best solar viewing equipmentView Deal

A compact smart telescope is a wise choice for eclipse chasers who are after more than just a few smartphone snapshots. The DwarfLab Dwarf Mini is a tiny, app-controlled telescope whose included magnetic solar filter allows solar observing.

It can quickly locate the sun and capture images revealing sunspots during partial phases of a solar eclipse. If and when totality arrives, simply remove the solar filter. You'll need to add your own tripod.

Read: DwarfLab Dwarf Mini smart telescope reviewView Deal

A stargazing tent makes sense for anyone planning to watch the Perseids long after the eclipse. Sky View Tents use near-transparent mesh walls so you can lie in a sleeping bag and keep watching the sky, making them useful for meteor watching and the Milky Way.

The two-person Backpacker Stargazing Tent is roomy enough for lying back, quick to pitch and has an internal rainfly that can be deployed without getting up. At 5.6 pounds (2.6 kilograms), it’s better for car camping or short dark-sky hikes than long backpacking trips.View Deal

You'll likely arrive early to secure a good location. Then you'll spend hours watching the eclipse unfold before darkness finally arrives and the Perseids begin. A lightweight folding chair is therefore one of the most valuable things you can bring.

The Nemo Stargaze EVO-X is a suspended, gently rocking chair that reclines smoothly, with a padded headrest that makes long sessions under the stars far easier on the neck. It’s excellent for meteor-watching, reading and relaxed binocular use, with pockets for a phone or drink. However, it is bulky, heavy and body-size-dependent, so it’s better for car-based observing than for backpacking.View Deal

A sturdy travel tripod is essential if you want sharp eclipse photos, twilight shots of Venus or wide-field images of the Milky Way and Perseids.

The Peak Design Travel Tripod is unusually narrow when folded, quick to set up and stable enough for full-frame cameras, yet it also hides a smartphone mount in its center column, making it useful for both serious cameras and phones. Its compact ball head keeps the whole package sleek for travel, while the fast leg locks make set-up and takedown easy in the dark. However, it is expensive and not especially tall.View Deal

A fast wide-angle lens is the classic choice for photographing the Perseids and the Milky Way after the eclipse. The Sigma 14mm f/1.4 DG DN is a huge, heavy wide-angle lens for full-frame cameras that achieves f/1.4 aperture — the first such lens to do so.

That means shorter exposures, lower ISO settings and cleaner night-sky images which, with luck, will be stuffed with "shooting stars." It's sharp and well built, but it's expensive.

Read: Best lenses for astrophotographyView Deal

7 ways to photograph the 2026 total solar eclipse — from smartphone to telescope

27 July 2026 at 12:00

The total solar eclipse on Aug. 12, 2026, will bring thousands of photographers to a narrow path of totality through eastern Greenland, western Iceland and northern Spain. For many, it will be their first opportunity to witness totality, the brief period when the moon completely covers the sun and reveals its delicate corona, a wonder of nature that normally remains hidden by sunlight.

Some first-time eclipse chasers heading to the path of totality pack expensive gear they've never used before, hoping to capture expert-level images without any preparation. Others just take a smartphone. Guess who usually comes back with the best images? Practice and rehearsal — or simplicity — are key.

Remember, you should never look at the sun directly without specialist solar equipment (unless you are in totality), or you risk permanent damage to your sight.

Preparing for totality

Photographing a solar eclipse is unlike photographing anything else. Solar safety matters, exposure changes dramatically, and totality lasts only a few precious minutes. Despite that, memorable eclipse photographs can be taken with almost any camera. The best approach depends on your equipment, your experience and what kind of memory you want to bring home.

However, you don't need to stand in the path of totality to photograph some of the event. Across much of Europe, a deep partial eclipse will occur near sunset, with more than 90% of the sun obscured in many locations. In northeastern North America, observers will see a smaller partial eclipse during the afternoon. While neither experience matches the drama of totality, both offer opportunities for striking photography.

1. Take a souvenir shot through eclipse glasses

solar eclipse glasses held in front of a smartphone camera

A souvenir shot of the partial phase can be taken through eclipse glasses or solar viewers. (Image credit: Jamie Carter)

To watch any partial solar eclipse, you'll need a pair of eclipse glasses or solar viewers; the former you wear and the latter you look through. Either works well as a solar filter for a smartphone. Simply wrap some eclipse glasses around your phone's camera lens or hold a solar viewer in front, and you can take basic images of a partial eclipse.

The way to get more than just a rough souvenir shot is to put your smartphone on a tripod or purchase a Solar Snap, which not only provides a solar filter that attaches to your phone with Velcro but also includes an app that zooms in on the eclipse.

If you want pinpoint sharpness without having to spend too much or travel with much gear, get yourself a smart telescope like the ZWO SeeStar S30 Pro, DwarfLab Dwarf Mini or Vanois Vespera Pro.

2. Use a smartphone during totality

total solar eclipse over a coastal city

You can get a great image of totality using just a smartphone. (Image credit: Getty Images)

If you're traveling to Greenland, Iceland or Spain to see the total solar eclipse, take a simple smartphone photograph during totality. A smartphone cannot compete with a camera's zoom lens for close-up detail, but it's perfect for recording a wide view of the landscape you're in.

In Greenland and Iceland, the eclipsed sun will hang about 25 degrees above the western horizon, making it possible to include fjords, volcanic landscapes or distant mountains in the frame. In Spain, where totality occurs late in the day, the low altitude of the sun offers opportunities to photograph the eclipse above villages, church towers, castles and mountain ridges.

Before the eclipse, switch off auto-flash and enable RAW images if your phone offers them. Burst mode works well — as does filming the event in 4K from a tripod and extracting stills later.

3. Take a wide-angle shot during totality

total solar eclipse

A manual camera and a wide-angle lens work well during totality. (Image credit: Getty Images)

Many photographers using a manual mirrorless or DSLR camera become obsessed with the corona and forget that the eclipse affects the entire environment. The resulting images often feel disconnected from the actual experience. A well-composed landscape photograph can communicate the atmosphere of totality far more effectively.

The image above was shot by expert eclipse photographer Alan Dyer, author of How to Capture the Coming Solar Eclipses, in Teton Valley, Wyoming, during the Aug. 21, 2017, total solar eclipse. It was shot with a Canon 6D and a 14mm SP Rokinon lens at f/25 for 1/10 second at ISO 100. It's one shot from a 700-frame time-lapse and was taken just as totality began, moments after the diamond ring ended, and the dark shadow of the moon is approaching from the west.

4. Capture crescent suns

Shadows showing crescent suns photographed on a man's head

Shadows showing crescent suns can be imaged on people's faces during a partial solar eclipse. (Image credit: Jamie Carter)

When a partial solar eclipse reaches about 50% — something it will only do in extreme northeast Canada and Europe on Aug. 12, 2026 — it's possible to project crescent suns through anything with defined holes. It works really well through a colander or spaghetti spoon.

By projecting crescent suns onto the floor, the walls and people around you, unique portrait images of eclipse chasers can be created. Unlike photographs of the corona, which thousands of people will capture, photographs like this, which document the human experience of an eclipse, can be really special.

5. Take a close-up of the solar corona

solar corona during a total solar eclipse

A close-up of the solar corona is the aim of many eclipse chasers. (Image credit: Getty Images)

This is the classic eclipse photography setup and the one most commonly used by experienced eclipse chasers — though it demands some serious equipment, commitment and practice.

A camera fitted with a telephoto lens between 200mm and 600mm provides enough magnification to reveal detail in the corona while remaining portable enough for travel. At 400mm, the eclipsed sun fills a useful portion of the frame. At 600mm, the corona becomes significantly more prominent and fine detail begins to emerge. Lenses like the Canon RF 200-800mm f/6.3-9 IS USM, Sony FE 200-600mm f/5.6-6.3 G OSS and SIGMA 150-600mm f/5-6.3 DG DN OS Sport would be good options.

Focus carefully on the partially eclipsed sun through a solar filter, and leave the focus untouched thereafter. With a camera set to ISO 100 and f/5-f/8 aperture, exposure bracketing is essential because the corona spans an enormous range of brightness. Automated exposure sequences, or bracketing, allow photographers to capture multiple exposure levels to combine later, if desired.

It's always best to rehearse in advance; the excitement of totality very often leads to basic errors — the classic being leaving the solar filter on during totality.

6. Shoot a close-up sequence of the eclipse

Composite image of the phases of a solar eclipse against a black background. From left to right, the beginning to end of the process, with totality in the middle.

A composite view of various stages of a total solar eclipse. (Image credit: Getty Images)

If you want to shoot a sequence throughout the entire solar eclipse that shows all of the various stages, you need to be in position, ready to take images as soon as first contact occurs, and stay there until fourth contact.

Since the size of the sun won't be huge in your finished image, you don't need a huge telephoto lens. Instead, concentrate on imaging the partial eclipse at very specific times before and after totality, so that you can produce a mirror image on either side of an image of the solar corona.

7. Shoot a wide-angle sequence of the eclipse

solar eclipse sequence

A sequence of a total solar eclipse over Lac Brome, in the Eastern Townships of Quebec, Canada, on April 8, 2024. (Image credit: Getty Images)

A wide-angle eclipse sequence is a different kind of image, showing not just the changing shape of the sun, but the landscape. Start with a base exposure taken during totality, when the eclipsed sun sits in a darkened twilight sky, then layer in the partial phases at regular intervals from first contact to fourth contact.

The result can show the sun's path across the sky, the moon appearing to bite across it in the opposite direction, and even bright planets nearby. It's a powerful way to tell the whole story of an eclipse in one frame, especially if you include water, mountains, people or a dramatic horizon.

Dyer's image above is a single exposure taken with a Canon EOS Ra and a Canon RF15-35mm lens at ISO 125, f/2.8 and 1/6s. The partial phases were photographed every five minutes from start to finish of the eclipse.

Nanopositioning, customization and control: opening new frontiers in optical computing

23 July 2026 at 10:54
Photonics reimagined SmarAct and Akhetonics worked together to build a versatile optical test set-up to characterize next-generation photonic integrated circuits (PICs). SmarAct’s nanopositioning systems form the precision-motion core of the test workstation, while the positional reproducibility allows Akhetonics to map the full optical chip and evaluate large grids of test components rapidly and reliably. (Courtesy: Akhetonics)

German technology start-up Akhetonics is reimagining the future of high-performance computing (HPC), deploying its proprietary know-how in photonic-design automation and photonic integrated circuits (PICs) to realize the first all-optical digital computation devices. The end-game: an all-optical digital processor – what Akhetonics calls its reasoning processing unit (RPU) – that will fundamentally transform the way that data is processed, transmitted and stored at every level of the HPC stack.

While the anticipated upsides of photonic computing are compelling – think bandwidth scaling, energy-efficiency and reduced latency – the translation of Akhetonics’ R&D effort and early-stage PIC designs into at-scale implementation is still in its infancy. What’s evident even now, though, is that the start-up’s progress is being accelerated by collaboration, interdisciplinary expertise and innovation spanning photonic system design and precision-motion and control technologies.

Collaboration, co-development, customization

A case study in this regard is Akhetonics’ partnership with SmarAct, a German manufacturer and developer of specialist products for nano- and picometre-precise positioning, metrology and automated assembly. Both companies are shaping the future of photonics, albeit along complementary tracks: Akhetonics with its vision of a full-stack photonic computing architecture; SmarAct with a portfolio of enabling technologies that’s helping to make next-generation optical computing a practical proposition.

The two vendors began working together after an initial meeting four years ago at the European Conference on Optical Communication (ECOC 22) in Basel, Switzerland. Top of the Akhetonics shopping list: a versatile optical test system to characterize its advanced PICs.

Versatility is the key Leonardo Del Bino, Akhetonics’ CTO. (Courtesy: Akhetonics)

“There are off-the-shelf PIC characterization systems on the market, but they all impose constraints on our design options,” explains Leonardo Del Bino, co-founder and chief technology officer (CTO) at Akhetonics. “Instead, we teamed up with SmarAct to co-develop a compact and modular test architecture built to our exacting specifications. The resulting set-up gives us the flexibility to evaluate and optimize all sorts of innovative PIC designs.”

At the heart of the Akhetonics optical testing workstation sit two discrete nanopositioning subsystems: an XY-Rz chip platform (itself comprising three nanopositioning stages offering horizontal translation along the X and Y axes and rotation limited to the Z axis) and a Z-Rx-Ry “pivot” for an optical probe (where translation occurs only along the Z axis, with simultaneous angular rotation around the X and Y axes). The test set-up (which also incorporates a digital microscope for PIC inspection and alignment) can be used without restriction in every degree of freedom, with the two subsystems working in tandem to ensure precise multi-axis positioning for optical coupling and electro-optic characterization tasks.

On a more granular level, each nanopositioning subsystem is based on SmarAct positioners equipped with integrated optical encoders (SmarAct’s METIRIO® sensors with a resolution of 1 nm) along all six axes of motion. The first subsystem provides three degrees of freedom for lateral alignment (with 49 mm travel in both X and Y, 360° rotation around Rz and a unidirectional positional repeatability of ±40 nm per linear axis). The second subsystem provides vertical and angular alignment (with 31 mm travel in Z, ±5° tilt around Ry, ±45° rotation around Rz and a unidirectional positional repeatability of ±40 nm for the linear Z axis).

To evaluate new PIC designs, Akhetonics’ optical test routines focus primarily on measuring and minimizing insertion losses between input/output fibres and on-chip planar waveguides. Typical measurements include wavelength- and polarization-dependent coupling losses (for example, when a fibre array couples laser light into a series of on-chip grating couplers or when light is coupled from a planar waveguide back into an optical fibre). The subsequent integration of electrical probes into the test system (using two separate XYZ probe towers) supports electro-optic characterization of key on-chip building blocks like optical modulators and photodetectors.

“The requirements for the electro-optical testing are nothing crazy,” says Del Bino. On-chip electrical contacts are in the ballpark of 100 μm x 100 μm, so Akhetonics engineers need positional and alignment precision an order-of-magnitude better than that for their electrical probes. “On-chip optical testing is a different story,” he adds. “A fibre-waveguide mismatch of 1 μm means significant coupling losses, so we need positional accuracy and repeatability of tens of nm or less.”

The rewards of reciprocity

Operationally, the custom test system is the result of ongoing collaboration between the engineering team at Akhetonics and the product development team at SmarAct. After firming up performance requirements, the two vendors iterated back-and-forth with 3D CAD drawings before converging on a final agreed system design.

Line-of-sight Max Trippel, SmarAct’s business development manager for photonic applications. (Courtesy: SmarAct)

“We supplied the nanopositioning stages that form the precision-motion core of the workstation,” explains Max Trippel, SmarAct’s business development manager for photonic applications. Akhetonics then integrated these modules into its own test environment, including the fibre and fibre-array-unit holders; the required optical and electrical measurement equipment; and the software routines for photonic characterization. “This approach gives Akhetonics the flexibility to build exactly the test workflow it needs, while relying on a stable and repeatable positioning platform,” Trippel adds.

Crucially, the SmarAct software “ecosystem” and Python interface make it easy to integrate the nanopositioning stages within Akhetonics’ PIC test routines. That software application platform, known as the SmarAct Control and Process Environment (SCoPE), also creates opportunities for continuous process improvement and product innovation (for example, the ability to develop custom routines for fast calibration and alignment on all axes).

In this way, SCoPE will be a natural fit as Akhetonics transitions its PIC testing programme from an R&D setting through small-batch production runs and, ultimately, to volume manufacturing capability (see “SCoPE in brief”, below). “Our goal with SCoPE is to provide customers with easy access for system development, whether that’s for the testing or assembly of photonic components,” says Trippel. “SCoPE is a living platform and we’re constantly integrating novel functionalities and application-specific plug-ins as well as features to facilitate control of third-party devices.”

Strategically, the SmarAct-Akhetonics partnership is shaping up as a win-win for the long term, with the latter’s growth trajectory and evolving platform technologies feeding into SmarAct’s product development roadmap. “Our customers’ success is our success,” Trippel concludes. “Working in this way with Akhetonics and its peers means we have line-of-sight on ‘what’s next’ in photonic computing. Watch this space: the last word has not been spoken.”

SCoPE in brief

The SmarAct Control and Process Environment (SCoPE) is a modular and extensible software application platform that combines visual process modelling, Python scripting and hardware integration. SCoPE enables customers to develop, control and run automated processes in a unified environment that offers…

Reciprocal benefits The custom test system is the result of an ongoing collaboration between the engineering team at Akhetonics and the product development team at SmarAct. (Courtesy: SmarAct)
  • Process modelling and automation: visual drag-and-drop process editor enables intuitive creation, control and execution of automation workflows. Live process display gives users direct feedback during execution.
  • Python scripting backend: integrated Python scripting allows developers to extend workflows with custom logic, algorithms and third-party devices to create advanced automation scenarios. Package and dependency management are built-in.
  • Device control and hardware integration: native support for SmarAct hardware such as positioning systems, controllers, grippers and interferometers through specialized plug-ins.
  • Custom user interfaces: flexible Qt widget integration makes it possible to build tailored graphical user interfaces for specific applications.
  • Data visualization and imaging: configurable plotting widgets, real-time data visualization, process messaging and an integrated image processing pipeline support instant process feedback and image-based automation tasks.
  • Plug-in architecture: the modular plug-in system enables SmarAct and third parties to extend SCoPE with additional functions, algorithms, hardware integrations or communication interfaces.

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Structured light could deliver a new method for diagnosing eye disease

20 July 2026 at 15:00

By controlling a type of polarized light widely used in quantum optics, researchers have transformed subtle optical patterns in our peripheral vision into vibrant, easily perceptible shapes. Led by Dusan Sarenac at the University of Waterloo, Canada, the team showed for the first time that the “Boehm’s brushes” perceived by participants can be altered by adjusting the topology of spin-orbit coupled light. Their results, reported in Proceedings of the National Academy of Sciences, could lead to promising new techniques for checking our eye health.

For the most part, human eyes are incapable of detecting polarization in visible light. But in some rare cases, structures inside the eye itself can scatter light in different ways depending on its polarization, creating subtle yet perceivable “entoptic” patterns. Perhaps the best-known examples of these are “Haidinger’s brushes”: hourglass-shaped patterns that can form in our central vision, but only when viewing linearly polarized light at blue wavelengths.

In 1940, Swiss biophysicist Gundo Boehm discovered another example: a two-lobed, bowtie-shaped entoptic pattern that forms when viewing linearly polarized light in the peripheral vision as it scatters from subcellular structures in the inner retina. Unlike Haidinger’s brushes, this lesser-known effect is driven by angular variations in scattering strength relative to the polarization direction.

But as Sarenac explains, these ethereal shapes are more than just a curiosity. “Because retinal disease may alter a person’s ability to perceive the pattern, researchers have long considered whether Boehm’s brushes could serve as a biomarker of retinal health,” he says. “However, their weak visibility has limited practical use.”

Whereas previous studies simply asked participants to passively observe the effect, Sarenac’s team considered what would happen if the light’s polarization was constantly varied. To explore this possibility, the researchers created a beam of spin-orbit coupled light, in which polarization is linked to the light’s orbital angular momentum – a property describing how the wavefront twists as the beam travels – so that the polarization direction rotates steadily across the beam.

In quantum optics, these structured waveforms are already being widely explored for their possibilities in imaging, communication and information processing. But for the first time, Sarenac’s team considered how our eyes could actually perceive this light. “We engineered the spatial polarization of the light to match the symmetry of the retinal scattering response,” Sarenac describes. “This allowed many weak local contributions to reinforce one another.”

The researchers then projected this structured light through a ring-shaped aperture, targeting specific regions in the periphery of participants’ retinas, which could also be adjusted to target varying distances from the centre of vision. Using an automated test, they measured how much contrast participants needed to reliably distinguish a Boehm’s brush from the background at these varying distances.

Based on the subject’s responses, Sarenac’s team determined that the use of spin-orbit coupled light not only made Boehm’s brushes appear far more vivid to the participants, it also transformed the bowtie shape into a multi-lobed pattern, with the number of lobes varying depending on the topology of the light’s twisting polarization.

“Across 11 participants, detection thresholds improved exponentially away from the centre of vision, and the pattern became robustly visible at approximately one degree of retinal angular distance,” Sarenac describes. These results reveal a fascinating link between human vision and quantum mechanics, which the team hope could be harnessed in practical healthcare. With further studies involving patients with retinal disease, they now envisage eye tests where retinal conditions could be diagnosed in people who can’t clearly perceive vibrant, multi-lobed Boehm’s brushes in their peripheral vision.

“In the longer term, these patterns may provide a non-invasive functional probe of retinal integrity because their shape and visibility can be measured across different retinal locations,” Sarenac says.

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Sunlight can produce correlated pairs of photons

15 June 2026 at 09:00

Producing pairs of correlated or entangled photons usually requires a complex laser system. Now, however, researchers at China’s Xiamen University have shown that these crucial ingredients in quantum optics experiments can come from a far more basic source: sunlight. The discovery could simplify optical systems that rely on a process known as spontaneous parametric down-conversion (SPDC), allowing the technology to be deployed in space and other locations with limited or no access to electricity.

SPDC occurs when a short-wavelength photon passes through a nonlinear crystal and gets converted into twin photons with a longer wavelength. Traditionally, the initiating (pump) photon in this paired-photon source comes from a coherent laser. However, recent research suggested that fully coherent light sources might not be strictly necessary, and that partially coherent sources might also be able to drive SPDC.

A Sun-tracking system

In the new work, researchers led by Wuhong Zhang and Lixiang Chen took this idea even further. Could sunlight – which is inherently incoherent – also drive SPDC?

In principle, Zhang and Chen suspected the answer was “yes”. After all, a ray of sunlight, like a laser beam, is just a stream of photons. The problem is that unlike photons from a laser, the brightness and incidence angle of solar photons is constantly changing. This makes it difficult to collect enough pump photons to produce correlated photon pairs at high rates.

To overcome this problem, the researchers installed a Sun-tracking system on the roof of their laboratory building. This was essentially a telescope mount that moves with the Sun to collect light continuously throughout the day. They then worked out how to efficiently couple this collected sunlight into a multi-mode fibre and transmit it into their laboratory. There, they used the light to pump a nonlinear crystal made of periodically poled potassium titanyl phosphate (PPKTP). Within this crystal, the SPDC process converted pump photons into correlated photon pairs, demonstrating that it is indeed possible to use sunlight to generate photon pairs with strong position correlations.

The team faced numerous challenges along the way. The low spatial coherence and temporal instability of sunlight needed to be mitigated, and the coupling into the fibre needed to be very efficient. However, Chen notes that sunlight does have one advantage over traditional laser sources. “Sunlight is inherently broadband in its spectrum, so it can precisely provide any favourable wavelength,” he says. “This means it could be adapted to diverse application scenarios.”

Towards laser-free and electricity-independent SPDC light sources

According to Zhang, the team’s work shows that laser-free and electricity-independent SPDC light sources are possible. Potential applications could include correlation-enhanced sensing in remote areas and space-based quantum key distribution and teleportation, and he tells Physics World that one of the team’s next goals is to test the system in outdoor environments.

Chen adds that the system, which is described in Advanced Photonics, could also become a platform for fundamental studies of how the coherence of light affects the photon-splitting process in SPDC. He and his colleagues are now focusing on improving the efficiency of their sunlight collection system; optimizing the design of their nonlinear crystal so that it is better adapted to the Sun’s broadband spectrum; and implementing advanced image reconstruction techniques such as compressed sensing. “We think that introducing AI technologies such as artificial neural networks and deep learning into such imaging systems will be a key priority in going forward,” Chen says. “They will inform us on how to exploit sunlight more efficiently to implement various advanced quantum information protocols.”

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