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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.

The post Nanopositioning, customization and control: opening new frontiers in optical computing appeared first on Physics World.

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.

The post Structured light could deliver a new method for diagnosing eye disease appeared first on Physics World.

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.”

The post Sunlight can produce correlated pairs of photons appeared first on Physics World.

What happens when you try to chop a photon in half?

22 July 2026 at 15:17

A photon is a single particle of light, and under normal circumstances, it can't be divided. But a photon is also not a particle, in the sense that it does not have a specific location. Instead, it is an extended object.

So if a photon is only partway through the process of reflecting from a perfect mirror and you yank the mirror away, what happens? The answer, from a trio of Norwegian physicists, turns out (arxiv.org link) to be more complex than I expected.

A photon divided?

Let’s first talk briefly about dividing and combining photons. If this were a common experience in our lives, then shining a single color of light through a piece of glass or reflecting it from a surface might cause photons to divide or combine. This would lead to an amazing array of colors: Our universe would be the most fantastic and legal LSD trip you could imagine. But this doesn't generally happen, hence LSD.

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Topological Jackiw-Rebbi States in Photonic Van der Waals Heterostructures

19 July 2026 at 04:08

A new study is turning an elegant quantum idea into a practical platform for light. In research published in Light: Science & Applications, physicists report “topological Jackiw–Rebbi” states engineered inside photonic van der Waals heterostructures—systems built by stacking atomically thin materials with precisely tailored interfaces. The result is a photonic phenomenon that echoes how particles can be trapped at boundaries where the rules of their governing equations change.

The work builds on the classic Jackiw–Rebbi mechanism, originally proposed for relativistic particles. In those models, a localized mode appears when a mass term flips sign, effectively creating a domain wall. The authors translate this concept into optics by designing photonic structures where an effective “mass” characterizing light propagation changes across an interface.

What makes the platform especially compelling is the van der Waals architecture. Unlike conventional fabrication routes that can introduce disorder, the layered nature of these materials enables sharp, controllable boundaries and tunable photonic band structures. By adjusting the stacking and interlayer optical responses, the researchers create conditions in which topological modes become robust against typical imperfections.

The study emphasizes that these states are not merely conventional guided resonances. Instead, they are tied to topology: the light modes are associated with an invariant property of the band structure. As a consequence, the Jackiw–Rebbi-like photonic states are expected to persist even when the system’s details vary, so long as the relevant symmetry and band configuration remain intact.

Topological protection is more than a slogan. In photonics, it can translate into reduced sensitivity to fabrication tolerances and a pathway toward devices that rely on stable boundary transport. The paper therefore positions these localized states as building blocks for future optical components that route signals along designed interfaces.

The authors demonstrate the concept theoretically and connect it to experimental observables by focusing on how the interface should host modes localized near the domain wall region. Such localization is a hallmark of the Jackiw–Rebbi scenario, now realized in a controllable, designer photonic environment.

Beyond fundamental interest, the approach could influence the design of reconfigurable photonic circuits. Because van der Waals stacks can be combined and adjusted, the same topology-driven logic may be extended to new material systems, wavelengths, and device geometries.

Overall, the report signals a broader trend: using topological field-theory ideas to engineer light–matter behavior in atomically precise platforms, potentially enabling the next generation of robust, interface-based photonic technologies.

Subject of Research: Topological photonic states (Jackiw–Rebbi) in van der Waals heterostructures.

Article Title: Topological Jackiw-Rebbi states in photonic Van der Waals heterostructures.

Article References: Randerson, S.A., Bouteyre, P., Hu, X. et al. Light Sci Appl 15, 323 (2026). https://doi.org/10.1038/s41377-026-02392-5

Image Credits: AI Generated

DOI: 10.1038/s41377-026-02392-5

Keywords:

We tested Canon’s $10,000 wildlife zoom — can it replace a prime lens?

15 July 2026 at 17:00

When it comes to the "silly money" category of lenses, they are typically those ridiculously long prime lenses that make your arms ache just by looking at them. They provide incredible image quality but lack the versatility of a zoom. Enter the Canon RF 100-300mm f/2.8L IS USM: With a constant f/2.8 aperture throughout the entire 100-300mm focal range, this lens is a serious contender for wildlife pros and sports photographers.

Of course, at an eye-watering $10,500, it's not for everyone. It's not even for "many people"; it's for a select few who either have serious money lying around or make serious money from photography, where a lens of this caliber would be a sensible investment. Still, we took it for a test drive to see just how much better the performance is compared to the more reasonably priced wildlife zoom lenses.

Canon RF 100-300mm f/2.8L IS USM: Design

Canon RF 100-300mm f/2.8L IS USM lens against green foliage
Kimberley Lane
Canon RF 100-300mm f/2.8L IS USM lens against green foliage
Kimberley Lane
Canon RF 100-300mm f/2.8L IS USM lens against green foliage
Kimberley Lane
  • Weight is surprisingly manageable
  • Internal zoom
  • Solid and sturdy build quality

Although its weight is comparable to that of the much cheaper SIGMA 60-600mm Sport lens we tested recently, this lens from Canon is actually the lightest f/2.8 300mm lens on the market. And because the zoom is internal, the weight distribution feels much more manageable in the smaller package than it does on a lens that extends. (But that’s not to say our arms weren’t aching the following day).

It's also dust- and weather-resistant, which we’d expect on a lens that's this expensive. It's solid and sturdy with a plethora of lens coatings to eliminate glare and ghosting, and it feels every bit the professional-grade Canon L lens you would want.

It comes with plenty of buttons and switches on the barrel, including the standard AF/MF switch, focus limiter and IS on/off. It has another switch to choose between three stabilization modes (mode 1 for static subjects, mode 2 for panning and mode 3 for tracking erratic moving subjects).

The final switch is a focus preset button, which enables you to pre-focus on a certain spot where you expect the action to be, then switch back and forth as you're shooting. Alternatively, you can set this switch to L-Fn to utilize it as a programmable function button instead.

Key specs:

Type: Canon full frame, mirrorless
Focal length: 100-300mm
Aperture: Constant f/2.8
Close focusing distance: 5.9 feet / 1.8 m (constant)
Image stabilization: 5.5 stops
Filter thread: 112 mm
Dimensions: 5.04 x 12.73 inches / 128 x 323.4 mm
Weight: 5.7 lbs / 2,590 g

This lens isn't expensive because it introduces any revolutionary build features. It's expensive because Canon has combined every premium design element — internal zoom, magnesium construction, professional weather sealing, compact packaging and meticulous engineering into a lens that is designed to meet the needs of professional photographers.

Canon RF 100-300mm f/2.8L IS USM: Performance

happy red panda sat in a tree
Kimberley Lane
red panda peering over a tree branch
Kimberley Lane
happy red panda sat in a tree
Kimberley Lane
golden labrador looking to the side
Kimberley Lane
brown dog looking to the side
Kimberley Lane
giraffe with its tongue out
Kimberley Lane
  • Outstanding image quality
  • Basically no image defects
  • Beautiful bokeh

Image quality is, unsurprisingly, absolutely beautiful. The shots we took are razor-sharp and clean with basically no defects whatsoever. There's a tiny bit of distortion, which is easily corrected in Lightroom (and wouldn't be detectable unless you were directly comparing the before/afters), but the images have no chromatic aberration or vignetting at all.

This lens shows every strand of fur or feather and effortlessly captures the moment perfectly every time. The bokeh is soft and creamy thanks to the constant f/2.8 aperture, which beautifully isolates the subject and blurs out distracting background elements.

We took images at f/2.8, f/4, f/5.6, f/8 and f/11 at 100mm, 200mm and 300mm to see how the lens performs across a variety of settings. Looking at the center portion of our test chart shots, the sharpest images are f/5.6 at 100mm, f/2.8 at 200mm and f/2.8 at 300mm. At 100mm, our f/2.8, f/4 and f/5.6 shots were all of similar quality in terms of central sharpness, but f/5.6 has the edge when it comes to contrast.

Those same three apertures were also very similar at 200mm, but in this instance, f/2.8 has the edge. At 300mm, there was a significant drop in contrast between f/2.8 and f/4, but both images were of similar sharpness. Unsurprisingly, the corners were sharpest towards the f/8 range, but wildlife photography rarely ever calls for sharpness across the entire frame, so the softer corners at f/2.8 - f/5.6 aren't a dealbreaker.

Canon RF 100-300mm f/2.8L IS USM: Functionality

sausage dog stood next to a stream
Kimberley Lane
red panda walking along a tree branch
Kimberley Lane
brown dog looking to the side
Kimberley Lane
red panda climbing on tree branches
Kimberley Lane
giraffe looking to the side
Kimberley Lane
meerkat sat in the shade
Kimberley Lane
  • Constant f/2.8 aperture throughout the whole zoom range
  • 5.5 stops of image stabilization
  • Versatile focal length and teleconverter compatibility

A big selling point with this type of lens is the constant f/2.8 aperture throughout the entire focal range — and this is a common feature with many lenses at this price range. The wide aperture allows for faster shutter speeds, which is ideal for capturing sharp images of fast-moving wildlife or sports photography, and the wide aperture also increases light intake in low-light situations, like photographing animals at dawn or dusk or indoor sports.

Although the 100-300mm focal length wouldn't be the best choice for photographing small birds or distant subjects, it provides a good focal range to cover many other types of wildlife, like equine or safari photography, as well as a variety of indoor sports. While it's not the biggest zoom range on offer, it eliminates the need to switch between lenses while on a shoot.

This, in turn, means faster reactions to changing scenes, less chance of missing shots when the subject moves unexpectedly and better protection from dust and rain due to less swapping. Plus, when paired with the Canon 1.4x teleconverter, this lens becomes a 140-420mm f/4, and a 200-600mm f/5.6 with the 2x extender, opening up the possibilities even further.

With the lens's 5.5 stops of image stabilization (which increases to 6 stops when paired with EOS R cameras with IBIS), this lens has no trouble following fast-moving subjects smoothly and efficiently — which is useful for both image quality and viewfinder steadiness.

Should you buy the Canon RF 100-300mm f/2.8L IS USM?

author Kimberley Lane using the Canon R6 III and Canon RF 100-300mm f/2.8L IS USM lens in a wooded area

(Image credit: Kimberley Lane)

It feels counterintuitive to give this lens 5 stars but say "no, don't buy it," and it's not that we're saying "don't buy it," but as good as this lens is, it's quite niche, and we are finding it hard to justify the price compared to other setups from Canon.

Currently, this lens is the only way to get 300mm at f/2.8 (unless you get a used EF 300mm f/2.8L IS II USM and an EF-EOS R adapter), so unless you really need to shoot between 200-300mm at f/2.8 and have the money to do so, there are more sensible options that either save money or give you more value.

For example, you could buy an R1 and a used EF 300mm f/2.8L lens with an adapter for around the same price as this 100-300mm lens. And if you find good deals, you could even add the Canon RF 70-200mm f/2.8L IS II USM to that lineup with a teleconverter. The only advantage the 100-300mm would then have is that you wouldn't need to change lenses — but is that worth such a steep price?

If this lens isn't for you

Canon RF 600mm f/2.8L IS USM on a white backgroundFor serious birders

Canon RF 600mm f/4L IS USM

For birds or distant wildlife, the Canon RF 600mm f/4L IS USM lens will be more appropriate. Although you lose a bit of aperture at the wide end, it won't make too much difference in practice, and the longer reach makes this lens much more suitable for photographing birds.

Canon RF 70-200mm f/2.8L IS USM on a white backgroundIf you want a cheaper telephoto zoom

Canon RF 70-200mm f/2.8L IS USM

For photographers who don't need 300mm very often and want to save several thousand dollars, the Canon RF 70-200mm f/2.8L IS USM covers up to 200mm and also has a constant f/2.8 aperture. Plus, it's a lot lighter and more compact.

Canon RF 200-800mm F6.3-9 IS USM on a white backgroundIf you prioritize reach over speed

Canon RF 200-800mm f/6.3-9 IS USM

If you photograph distant subjects or small birds in good light and you need more reach, the Canon RF 200-800mm f/6.3-9 IS USM has the most reach of any Canon zoom and produces beautiful images.

Read our full Canon RF 200-800mm f/6.3-9 IS USM review

Canon EOS R6 III review: A wildlife wonder

10 July 2026 at 13:00

The Canon EOS R6 III is Canon's newest full-frame camera. We absolutely loved the R6 II when we reviewed it, and the Mark III's improved 32.5MP resolution, 7K video capability and CFexpress compatibility build on that strong foundation to take this camera from the beginner and enthusiast level straight into the serious intermediate camera category.

We primarily tested it for wildlife photography with Canon's 100-300mm f/2.8L IS USM lens, but the R6 III is such an impressive all-rounder, it can easily turn its hand to astrophotography, sports or event photography, too.

Canon EOS R6 III: Design

Canon EOS R6 III
Kimberley Lane
Canon EOS R6 III
Kimberley Lane
Canon EOS R6 III
Kimberley Lane
Canon EOS R6 III
Kimberley Lane
Canon EOS R6 III
Kimberley Lane
  • Comfortable grip to accommodate larger lenses
  • Identical layout to previous model
  • One SD card slot, one CFexpress card slot

Existing Canon users will feel right at home with the Canon EOS R6 III, as the build and button layout are nearly identical to the R6 II, and similar to many other R-series bodies. We tested the R6 III with the Canon RF 100-300mm f/2.8L IS USM lens and found it comfortable to get a good grip on, and it feels satisfying in the hand, especially when paired with bigger lenses.

Key specs:

Type: Mirrorless, full-frame
Resolution: 32.5 megapixels
Burst rate: 12fps mechanical, 40fps electronic
Image stabilization: 8.5 stops
Weight: 1.54 pounds / 699 g (with battery and card)
Battery life: 620 shots (CIPA)

The LCD screen and viewfinder are exactly the same as the Mark II, but there are a couple of small differences elsewhere in the design. The R6 III now has a CFexpress Type B card slot as well as an SD card slot, allowing for faster workflows and data transfer. However, considering this camera sits in the more intermediate level, we have to question whether two SD slots would be more useful for the majority of users, especially because CFexpress cards are more expensive. Plus, we used fast SD cards during our tests and encountered no problems at all with the write speed or buffer.

Canon EOS R6 III: Performance

smiling red panda climbing on tree branches
Kimberley Lane
sausage dog against grey stones
Kimberley Lane
yellow bird sat on a log
Kimberley Lane
red panda walking across tree branches
Kimberley Lane
lemur's face over a wooden shelf
Kimberley Lane
brown bear looking up to the sky
Kimberley Lane
golden labrador shaking water off its body
Kimberley Lane
giraffe eating straw
Kimberley Lane
  • An absolute joy for wildlife photography
  • 32.5MP sensor is a very welcome improvement over the Mark II
  • Autofocus and subject detection are accurate and sticky

The Canon EOS R6 III features more advanced AI-powered autofocus, which enables it to track people, animals and vehicles more easily compared with the Mark II. When we were photographing animals at a zoo, the autofocus was generally very good, although there were a few occasions when the camera got confused. The focus jumped between the giraffe’s eyes, nostrils and ossicones, and the camera couldn’t quite figure out what to focus on, even when the animal was facing towards the camera with the eyes in view. There were also a few unfortunate occasions when the camera would find and track an "eye" on the — how do we put this — wrong end of the animal. Generally, though, it was fast and accurate.

In our review of the previous model, the Canon EOS R6 II, we said, "Considering it's the next step up from the Canon EOS R8, we'd hoped for a bump in resolution. Matching the 32.5MP resolution of the crop-sensor Canon R7 would have given the R6 II an even sweeter spot between the R8 and the 45MP powerhouse Canon EOS R5 II." It seems Canon was listening, as the 32.5MP sensor in the Canon EOS R6 III sits perfectly between the beginner and professional lineups. The images are clean, detailed and not too noisy, making this camera a compelling choice for photographic styles that require excellent resolution without excessive noise.

Canon EOS R6 III: Functionality

red panda about to eat leaves
Kimberley Lane
giraffe eating straw
Kimberley Lane
winking red panda amongst green foliage
Kimberley Lane
meerkat stood on a rock
Kimberley Lane
red panda eating leaves
Kimberley Lane
meerkat lying down
Kimberley Lane
red panda in a tree
Kimberley Lane
  • Canon claims battery life allows for around 620 shots (CIPA) — we took around 6,000
  • Blackout-free burst shooting up to 40FPS
  • Pre-continuous shooting

For wildlife photography, blackout-free shooting enables you to follow the subject a lot easier as it's moving, to ensure you can keep the subject centered and maintain your composition. What's more, with the R6 III, you can shoot up to a massive 40 frames per second (FPS) blackout-free, which is perfect for fast-moving wildlife. (Keep in mind, this means you need to hone your timing to avoid the "spray and pray" method and end up with tons of photos of the exact same moment). This is one feature of a wildlife camera that makes a big difference.

The R6 III also features pre-continuous shooting, where it'll record up to 20 frames (approx 0.5 seconds) before the shutter is fully pressed — another useful feature for wildlife and sports photographers who need to capture fleeting moments.

The Mark III uses the upgraded LP-E6P battery, shared with the R5 II, which offers significantly more shots per charge than the LP-E6NH in the R6 II. That said, it means that if you're upgrading from a different Canon model, your current spare batteries won't work in the R6 III, so you'll need to invest in a few spares. However, we managed to get more than 6,000 photos without having to swap out the battery, so you won't need to worry about the battery running out unless you're shooting all day for multiple days.

Should you buy the Canon EOS R6 III?

We can confidently say: yes, you should buy it. It seems to tick all the boxes for a lot of shooting scenarios, whether it's your main wildlife camera or a backup body for weddings. The 32.5MP sensor produces beautiful images with minimal noise and accurate color reproduction; it's lightning fast with a 40FPS burst speed and can capture up to 7K 60p video. However, if you're looking for a more serious pro-level camera, perhaps opt for the R1 or R3 instead.

If this camera isn't for you

Canon EOS R1 on a white backgroundIf you want to go pro

Canon EOS R1

If you're looking for a professional body with maximum reliability, professional-level handling and overall increased performance, look at the Canon EOS R1.

Canon EOS R7 on a white backgroundIf you're a beginner

Canon EOS R7

Beginners or anyone on a budget should consider the Canon EOS R7. It has the same 32.5MP resolution, a 30FPS burst rate, and the APS-C sensor applies a 1.6x crop factor when paired with a full-frame lens to increase reach.

Read our full Canon EOS R7 review

Canon EOS R5 IIIf you want more resolution

Canon EOS R5 Mark II

The Canon EOS R5 II has a higher 45MP resolution with a stacked sensor, 8K video and a decreased but still impressive 30FPS burst rate.

Read our full Canon EOS R5 II review

Breakthrough in Optical Computing: Introducing the Digital Twin System

16 June 2026 at 13:49

In the rapidly evolving realm of artificial intelligence and deep learning, conventional electronic computing architectures are increasingly strained by the demands of large-scale data processing and intricate computational tasks. Optical computing has risen as a compelling alternative, leveraging the inherent physical phenomena of light—such as interference and diffraction—to execute computations fundamentally differently from traditional electronics. By harnessing these optical effects, optical computing systems (OCS) promise unparalleled advantages: notably superior processing speeds, heightened energy efficiency, and a natural aptitude for massive parallelism. These attributes make optical computing especially attractive for intensive applications like image processing, machine learning, and big data analytics, holding transformative potential across these domains.

Yet, despite these promising characteristics, contemporary optical computing platforms grapple with a significant bottleneck rooted in their hardware-centric development workflows. Conventionally, researchers must directly engage with physical OCS hardware to develop, tune, and validate computational tasks. This process entails sequential access to a limited number of costly and often heavily utilized devices. Users must physically occupy the system to load parameters, fine-tune configurations, and iteratively calibrate the hardware—an intrinsically tedious and time-consuming cycle. Each new user or task demands resetting the system state, leading to protracted queues, repetitive adjustments, and redundant calibrations. The resulting workflows impose long hours of equipment occupation and elevated trial-and-error expenses, stifling the possibility for concurrent task development and drastically curtailing research throughput and system agility.

To surmount these entrenched challenges, cutting-edge research has introduced the concept of the Digital Twin Optical Computing System (DT-OCS). This innovative approach establishes a high-fidelity digital replica—a “digital twin”—of the physical OCS that accurately models its input-output behavior under varying configuration parameters. Crucially, the digital twin allows researchers to perform extensive offline simulations, training, and optimization without the constraints of physical hardware availability. Analogous to a digital simulator software that mirrors a complex “real machine,” DT-OCS enables extensive task development and parameter tuning within a virtual environment, dramatically decoupling software development from hardware dependency. Consequently, optimized parameters validated digitally can be seamlessly transferred back to the physical system for deployment, bypassing numerous iterative hardware trials.

The implications of DT-OCS extend well beyond mere time savings. By effectively creating a “digital development toolkit” for optical computing, this framework revolutionizes the research ecosystem—transforming optical computing platforms from isolated, hardware-bound experiments to versatile, shareable research infrastructures. Researchers can now conduct task training, performance benchmarking, and method comparisons entirely within a unified digital realm, fostering collaborative innovation. Distinguished from legacy OCS paradigms, DT-OCS supports parallel task development workflows, allowing multiple computational problems to be advanced simultaneously without hardware conflicts. This capability markedly enhances flexibility, reduces development bottlenecks, and accelerates the maturation and practical adoption of optical computing technologies.

Envisioning the trajectory of optical computing, the integration of digital twin models with physical hardware appears indispensable. Contemporary transportation systems, for instance, benefit from the synergy between tangible road networks and dynamic digital mapping platforms. Similarly, next-generation optical computing platforms should embody dual representations: a robust physical computing infrastructure supplemented by perpetually updated digital twins. This paradigm champions accessibility, reproducibility, and scalability—cornerstones for fostering broad-scale collaboration. It paves the way for unified validation standards and equitable performance comparisons, catalyzing optical computing’s evolution into a general-purpose, widely deployable resource rather than a niche experimental setup.

The DT-OCS framework’s hallmark is its strategic decoupling of task development from hardware constraints. In traditional optical computing, task training and parameter fine-tuning necessitate iterative hardware engagements involving adjustments, diagnostics, and recalibrations. This approach encumbers the process with inefficiencies and precludes simultaneous multi-task development. DT-OCS obviates these impediments by faithfully modeling the physical system’s responses across parameter spectra, enabling exhaustive offline optimization. This digital-first workflow increases research agility, minimizes hardware occupancy, and substantially compresses the development timeline. Consequently, DT-OCS amplifies the throughput and adaptability of optical computing research endeavors.

The real-world efficacy of the DT-OCS framework has been experimentally validated using a cutting-edge high-speed optical computing system incorporating silicon photonic feature-computing chips. These empirical studies demonstrated DT-OCS applications in diverse computational domains, including image classification and sequential decision-making. Notably, configurations optimized within the digital twin translated flawlessly to the physical hardware, with observed task performance closely mirroring digital forecasts. This underscores not only the high fidelity of the DT-OCS model but also its robust transferability across practical scenarios. Moreover, by enabling parallel task development within the digital domain, DT-OCS expedites the overall research workflow, markedly elevating efficiency.

An illustrative application of the DT-OCS system involved offline training and deployment for the Fashion-MNIST image classification task—a benchmark dataset widely used in machine learning. This practical demonstration affirms DT-OCS’s capacity to bridge digital model development with real-world optical computing implementations. Beyond efficiency gains, DT-OCS signifies a conceptual shift toward disentangling computational task design from the idiosyncrasies of physical system constraints. Historically, optical computing research has been hamstrung by its dependence on specific hardware platforms and accessibility limitations, hindering reproducibility and cross-task comparisons. The introduction of an open-source digital twin framework surmounts these barriers by democratizing access and standardizing evaluation protocols.

By openly releasing the DT-OCS framework alongside associated task datasets, the research fosters a community-driven ecosystem where software-based task design, training, and validation can proceed independently of physical system constraints. This openness engenders scalability, reproducibility, and collaborative potential that traditional optical computing architectures cannot easily achieve. Researchers worldwide gain the freedom to explore broader task horizons, perform comprehensive benchmarking, and validate innovative approaches within a consistent computational substrate. Such a paradigm shift propels optical computing from isolated experimental configurations into accessible and extensible platforms, expediting technological advancements and practical deployments.

This pioneering work advocates a transformative application paradigm for optical computing platforms: the symbiotic coexistence of physical hardware and computationally equivalent open-source digital twin models. Only by embracing such dual-system architectures can the field transcend limitations imposed by experimental variability and hardware scarcity. The resultant platforms will be shareable, replicable, and adaptable to a diverse array of research challenges. As optical computing moves towards becoming a mainstream computational resource, the principles embodied by DT-OCS may well establish the foundational infrastructure that underpins scalable, collaborative innovation in photonic information processing.


Subject of Research: Not applicable

Article Title: Digital twin optical computing system

News Publication Date: 21-Apr-2026

Web References:

References:
DOI: 10.29026/oea.2026.250254

Image Credits: Dr. Tingzhao Fu from the National University of Defense Technology, China, and Dr. Hongwei Chen from Tsinghua University, China


Keywords

Artificial intelligence, Computer science, Photonics, Engineering, Machine learning, Computer modeling, Computer processing, Semiconductors, Optics, Applied optics

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