The first number, or set of numbers, you see on your lens refers to its “focal length,” measured in millimeters (mm). Roughly translated, focal length relates to how close up or far away objects will appear when viewed through the lens. Essentially, the bigger the number, the more up close subjects will appear, and the smaller the number, the farther away things will appear.

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A ring light is a simple, cost-effective option that anyone can set up and use. It makes the most sense when you need just a bit more emphasis on yourself in a space without a lot of natural light and you don’t have the time or energy to invest in a pricier professional lighting setup.

Melanie Pinola covers home office, remote work, and productivity as a senior staff writer at Wirecutter. She has contributed to print and online publications such as The New York Times, Consumer Reports, Lifehacker, and PCWorld, specializing in tech, work, and lifestyle/family topics. She’s thrilled when those topics intersect—and when she gets to write about them in her PJs.

These accessories make using a ring light easier, but they’re just extras. Prioritize the features above when choosing a ring light.

Lenses with larger maximum apertures (generally 2.8 or larger) are often referred to as being “fast” because the larger apertures allow more light to reach the camera sensor, letting you shoot with faster shutter speeds in low-light situations where you might otherwise need a tripod. (Remember, larger apertures are actually smaller numbers; thus, f/2.8 is a larger aperture than f/8.)

Lighting plays an important role in the image quality of your videos and photos, second only to the quality of your camera. But you don’t have to invest in a complicated lighting rig to get better close-ups.

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Lenses with focal ranges of 35mm or smaller are generally considered “wide,” and lenses with focal lengths of 85mm or more are often referred to as “telephoto.” A lens around 50mm is roughly close to the way we see things with our eyes and is generally considered neither wide nor telephoto. It is often referred to as “normal” or “standard.”

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For the sake of example, let’s say your camera’s sensor has a crop factor of 1.5, and you’re curious how a 50mm lens would behave on it. To figure it out, take 50 (the focal length of the lens in question), multiply it by 1.5 (your camera’s crop factor), and you get 75. Thus, on your particular camera, a standard 50mm lens would behave like a 75mm lens.

When you look closely at a lens, there’s a fair amount of numbers printed on either the front of the lens itself (Figure 4.1) or somewhere around the rim (Figure 4.2)—and though it may seem like a bunch of mumbo jumbo, it’s actually pretty important info and can tell you a lot about the lens and what it’s capable of.

DigitekRing Light

How far or close you put a ring light depends mostly on your comfort level and the size of the light. But I found that for video-call purposes, somewhere between 2 and 3 feet was most flattering.

You can certainly find other lighting setups that produce better portrait or video lighting—such as this two-light kit Goodrich recommends, which includes lighting umbrellas, several light stands, and a number of photo bulbs. But they’re more expensive and more complicated to set up and break down.

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You should be able to bend the light and raise it up or down to get the most flattering light for whatever you’re shooting. People who wear glasses, for example, might need to raise the light and adjust it at a steeper angle to avoid glare and reflections.

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A ring light is exactly what its name suggests: a doughnut-shaped light, typically made of rows of LEDs. The halo shape diffuses light over a wide area, reducing shadows and washing away blemishes for a more-flattering appearance. The space in the middle of the light is a great place to mount a camera or phone because you get an even distribution of light around the lens.

In this paper a method is presented for evaluating image sensor sensitivity by measuring camera signal-to-noise ratio (SNR). The method is simple to implement ...

Color temperature, measured in kelvins (K), greatly affects the aesthetics of your photo or video. The room you’re in, the clothes you’re wearing, and your skin tone can all look different depending on the light’s color and temperature.

Look for lights that can adjust brightness in 1% increments. With some ring lights, you can adjust the brightness from 0 to 100% in 10% increments (10% brightness, 20% brightness, and so on), but we prefer models that let you fine-tune the brightness to the nth degree. Some ring light descriptions will specify this; it might be called “stepless adjustment.”

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Having multiple brightness levels means you can adjust the lighting to any environment—whether it’s cloudy or sunny, morning or night, or you have few or many other light sources.

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The bigger the ring light, the better the light output and quality. We looked at 10-, 12-, 14-, 16-, and 18-inch models suited for sitting at a desk or standing.

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Whether you work from home or you need to nail a job interview via Skype, these are Wirecutter’s tips for looking and sounding like a pro on video calls.

Wirecutter’s Melanie Pinola has spent years testing and reviewing various gear—including home-office essentials such as webcams, USB microphones, and office chairs—for Wirecutter and other sites including Lifehacker, PCWorld, Popular Mechanics, and Laptop Magazine.

“It’s really empowering,” said content creator and educator Gia Goodrich, “because you know that even if you’re showing up without makeup, you feel insecure, or you’re in your PJs, you can at least light yourself in a way that makes you feel good.”

To give you a better idea of how this all plays out in real life, look at Figures 4.3–4.7 and note the various focal lengths used to create each image. Photographed from the same position, the only difference between each shot is the focal length.

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Confused? For a visual explanation, take a look at Figure 4.8 to see how your lens views the world. The large box displays the image as it would be captured on a full-frame sensor, and the smaller box shows how the scene would be captured on a smaller-sized sensor. Same scene, same lens—different effective focal length.

The numbers on a point-and-shoot lens mean the same thing, but the scale is radically different, so don’t panic if your lens indicates a focal length range of 6–22.5mm (the equivalent of roughly 28–105mm).

Appearing on your lens right next to the focal length, you will find a numerical expression representing the maximum (largest) aperture opening that particular lens is capable of, usually expressed as “1:” followed by the maximum aperture. For example, a lens described as a 24mm 1:2.8 would be a fixed lens with a focal length of 24mm, whose largest aperture setting is f/2.8. The lens is still capable of smaller apertures (like f/11), but the largest it would be capable of is f/2.8.

More color temperature settings is better. Most of the ring lights we considered had at least three color-temperature settings: cool, neutral, and warm. We preferred those that offered more color-temperature steps between the coolest and the warmest levels; this allows you to dial in the setting that looks best with your skin and environment.

A professional video producer shows how you can tweak the lighting you have in your home office to elevate your video-call look.

The bottom line? Depending on your camera body (see the “Crop factor” sidebar), you may be able to get the close-up shots you’ve always dreamed of without having to pay for a super telephoto lens. In some cases, your 200mm lens might behave like a 300mm lens. Now that’s some serious bang for your buck!

More steps between the coolest and warmest color temperature levels mean more flexibility in suiting your skin and environment.

In Chapter 1, we talked about aperture and the role it plays in creating an exposure (keeping in mind that aperture is a function of the lens itself, not the camera body). Similar to the pupil of your eye, the aperture can dilate or constrict, letting in varying amounts of light and affecting the depth of field.

It’s also worth considering the height range of the ring light’s stand. The greater the range, the more versatile it will be to accommodate all kinds of situations.

Find the right temperature for your skin tone. Wirecutter’s Rago said that warm light generally works best for most skin tones, but if it’s too warm, a person could look orange. Bluish light can make a pale person look lifeless.

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After researching and testing more than a dozen ring lights, we’ve learned that it’s a fast-moving category with lots of brands that may be here today but gone tomorrow. Many of the best ring lights we’ve tested are either now discontinued or have recurring stock issues. This includes the Neewer 14-inch LED Ring Light (RL-14), Neewer 16-inch LED Ring Light (RL-16), Yesker 14-inch Ring Light, and Godox LR120 12-inch LED Ring Light.

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A single number, such as 24mm, represents what’s known as a prime or fixed lens, meaning that it’s not capable of zooming. Such a lens is designed and optimized for only a single focal length—in this case, 24mm.

CRI is one measure of light quality; the higher the CRI (the closer to 100, the better), the more colors the light can render and the more precise the image is color-wise.

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Without it, you can look grainy, out of focus, or even shadowy—like an anonymous witness in a true-crime show. A ring light is a simple tool whose diffuse glow can bring you out of the dark and make you look more professional.

It’s worth pointing out that some lenses are made specifically for cameras with smaller-sized sensors and have focal lengths that have already been converted. When in doubt, read the specifications or ask a knowledgeable salesperson.

These days, film has been replaced by digital sensors, and as luck would have it, they’re not all the same size. There’s a lot of math and science involved in the full explanation, but essentially, the discrepancies in sensor size are responsible for what we now refer to as “crop factor.”

Back in the glory days of 35mm film, it didn’t matter what camera body you used; as long as you were shooting 35mm film, the negatives were all the same size.

You might not find the CRI rating in the product description, but that doesn’t mean the ring light has a low CRI. Contact the manufacturer and ask for the number. If they don’t get back to you—or, worse, they don’t have a website—move on to the next ring light you’re considering.

More expensive doesn’t mean better quality. While researching this guide, we saw a Wescott 18-inch Ring Light that cost nearly $200 despite having only two color temperatures (cool and warm). Some ring lights cost twice as much as similar-size lights without adding more features or benefits.

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It’s easy to get up and running with Zoom, but you may not know about some of its best, most useful videoconferencing features.

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Expect to pay between $50 and $100 for a good ring light that has all of the features we mention above. Paying any more than that is likely throwing money away.

Some larger models have a built-in USB port for phone charging. A few lights we tested that are 14 inches or larger had a USB port for charging your phone while it’s attached to the ring light. That’s convenient for long shoots.

For anything else, a 14- or 16-inch ring light will do. These larger models should suffice if you want to keep the stand off of your desk or you plan on using the ring light while standing. The 14-inch ring lights we tested, including the Neewer 14-inch and Yesker 14-inch, were plenty bright in our testing. A 16-inch ring light, such as the Neewer 16-inch, would be brighter. But that extra luminance is really only useful if you’re going to position the light several feet away from you.

We still recommend these models if you can find them in stock. But if you can’t track them down, here are some tips that will help you choose a suitable replacement among a sea of similar-looking lights.

Of course, if your camera has a smaller sensor and you like to shoot at a lot of wider angles, the opposite would also be true. The 24mm lens you loved at the camera shop might behave like a 36mm lens on your camera body, meaning you’d need an ultra-wide lens to get a standard wide-angle shot.

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Wirecutter’s Rozette Rago and Michael Hession, our head of photography and video, helped me determine the most important features to look for in a ring light.

More flexibility is always better. Bonus points go to ring lights—such as the Yesker 14-inch—that include a flexible gooseneck mount for your phone; this is great for getting the angle of your phone just right too.

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10-inch lights aren’t great for most uses. These smallest lights had stands that raised the light only an inch off the desk, creating spooky, unflattering under-chin lighting. You could prop one of these lights up on a stack of large books or a box, but we think it’s worth paying a little more for a larger, brighter light that has a taller stand.

A range of numbers, expressed with a dash such as 70–200mm, indicates a zoom lens, capable of different focal lengths—in this case ranging from 70mm to 200mm.

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Many of the latest ring light models also have a Wi-Fi remote to power the light and adjust the color temperature or brightness.

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But going too big causes issues, too. On the flip side, the 18-inch models were overkill: They were so bright that they created washed-out images at all but the lowest brightness levels.

The result? Everything appears closer when shot on a camera body with a sensor that’s smaller than traditional 35mm film. Thus, a 50mm lens attached to a camera with a full-size sensor (referred to as full-frame) will behave like a regular 50mm lens. But the same lens on a camera with a smaller sensor (sometimes referred to as a cropped sensor) will be more like a 75mm lens.

Improving the lighting when you are in front of the camera isn’t just about vanity: Having great lighting that helps you look your best breeds confidence.

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We’ll be testing more ring lights soon with the goal of recommending specific picks. In the meantime, the current guide remains a reliable resource for finding great lighting options.

If you’ve spent time shopping for lenses, you may have noticed that a lot of zoom lenses feature not a single maximum aperture but, rather, an aperture range. If you have a lens that says 24–150mm 1:3.5–5.6, it means the lens is a zoom lens with focal lengths ranging from 24–150mm, whose maximum aperture varies depending on where you are within the zoom.

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In addition to a stand, most ring lights come with extras such as a carrying case for the light, a mount for your phone, and a Bluetooth remote to take a photo on your phone from a distance.

For desktop use, a 12-inch model is best. If you plan on using a ring light propped up on your desk—not on a tall stand on the floor—look for a moderately sized model, like the Godox LR120 12-inch LED Ring Light. These have stands designed for desktop use and cost less than larger models.

Smaller, USB-powered lights are great for mobile use. Ring lights that are 12 inches or smaller can be powered via USB, whereas the larger ring lights use an AC/DC adapter because they need to draw more power. So if you want a ring light that you can use outdoors—tethered to a laptop or USB power bank, without an outlet nearby—a ring light that’s 12 inches or smaller is ideal.

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To determine your camera body’s crop factor, you’ll have to read some of the techno babble in your user guide or jump online and look it up. Crop factor is typically listed among all the other tech specs related to your camera and usually has a value of something like 1.3, 1.5, or 1.6.

Depending on where you are within the zoom? What in the world does that mean? For example, if you’re zoomed all the way out wide to 24mm, you could achieve a maximum aperture of f/3.5. But once you zoom in, you lose the ability to open up your aperture all the way to f/3.5 as before and can then only open to f/5.6.

Depending on the camera body you have, you may have experienced or heard people talk about something known as “focal length crop factor,” “focal length multiplier,” or even just plain ol’ “conversion factor.” While this may, at first, seem confusing, it’s really quite simple and can sometimes be advantageous.

A CRI of 90 or higher is best. Ring lights with a CRI of 90 or above are considered excellent, whereas those with a CRI between 80 and 90 are thought of as good, according to Westinghouse Lighting.

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Melanie Pinola is a writer focused on home-office gear. To find the best paper shredder, she has shredded enough junk mail to fill several bathtubs.

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Our tests showed that a Bluetooth speakerphone won’t necessarily produce better results than a smartphone. But we found a few models worth checking out.