The larger the focal length is, the narrower the viewfinder range gets, and the smaller the field of view of the captured picture will be. So fewer scenes can be captured, but the proportion of the scene in the picture is very large.

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Generally, the focal length will be marked on the camera lens, such as 50mm, 24-70mm, etc. If there is only one number on the lens, it means that it is a fixed-focus lens, such as a 50mm lens, which means that the lens can only be fixed at a focal length of 50mm.

If you plan on using a ring light while on-the-go in various indoor or outdoor spaces, this ring light folds up, making it the most portable option on our list. The 10-inch ring light folds in half and fits in a carrying case so that it's easier to travel with.

This ring light from Neewer has everything you need if you are a creator looking to start making content. It includes an 18-inch light with 240 LEDs, two color filters (white and orange) to switch color temperature from 3200K to 5600K, a Bluetooth remote, an adjustable 29.5" to 61" aluminum alloy stand, and a carrying case to carry it all with you.

Its stand is also super sturdy and includes two shoe mounts and a 1 1/4"-20" mounting option for accessories like smartphones, digital cameras, and action cameras up to 10 pounds.

The light also has a hot shoe adapter that is compatible with most DSLR cameras and a smartphone holder for most smartphones. And, it's dimming knob design allows you to adjust brightness levels from 0-100%, making it easier to control the brightness of light when shooting.

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In this thermal image, as the focal length decreases, the field of view of thermal image becomes larger and larger, and more scenes can be captured by the infrared camera, but the target being captured will become smaller.

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Infrared camera modules developed by GSTiR team offer wide variety of lens types, such as fixed focus lens, zoom lens, motorized lens etc.

The best ring light is Neewer LED Ring Light since it comes with a full kit for everything you need to get started as a creator and has color temperature filters so you can adjust to whatever environment you're in.

Along with installation, we tested how dependable various smart lights are, such as whether the LEDs will randomly quit or get stuck in a random color.

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If you're looking for a smaller ring light, the Lume Cube Cordless Ring Light Mini is a great option at 12 inches. The light has up to a 97 CRI, so your natural coloring will stand out on video with this light. A display screen also makes it easy to fine-tune your brightness and color temperature levels.

You can plug this light into an AC adapter, or use the included battery for on-the-go, which can get up to 80 minutes of run-time when on the brightest setting.

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We've rounded up the best ring lights available to add some oomph to your online video content, whether you're looking to get into influencing or just want to look better on Zoom video calls.

While any of these ring lights are great options for creators, the right one for you will depend on what you will be using the ring light for, what size you prefer, and how much money you're willing to spend.

There are plenty of ring light options on the market, but not all of them will be great quality. Aside from our top picks above, here are a few other ring light options that are good alternative choices.

The Raya Bendie-Brite right light has a spring-loaded clamp to fit most smartphones up to 3.25 inches wide, but it also has a cold shoe for adding a microphone or an accessory arm to your setup.

For example, we need to change the size of the target in the picture during the shooting process. Using a fixed-focus lens requires the photographer to move his position back and forth; while using a zoom lens only requires us to change the focal length of the camera.

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Unlike regular lights, ring lights cast an even light onto whatever the subject is to reduce shadows in the face, illuminate eyes, and make those selfies flawless.

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While ring lights can cost you in the hundreds, this ring light from UBeesize is an affordable option at under $30. It has three color lighting modes: warm light (3000K), cool white (4500K), and daylight (6000K). In addition, each lighting mode has 11 brightness levels.

Included is a universal phone holder that extends up to 3.6 inches wide and rotates 360 degrees, so it can hold most smartphones. An included remote works with both iOS and Android OS phones.

When it comes to camera lenses, some people may know that there are fixed-focus lenses and zoom lenses. A fixed focal length lens means that the focal length is fixed, while a zoom lens means that the focal length of the lens is variable.

Ever wonder why your favorite influencer always has the best photos and videos? It's most likely because they use a ring light. Ring lights add additional light to creators talking to a camera, product photography, TikTok video skits, and more.

There is an included AC power adapter for when you're in the studio, but there are also two lithium-ion batteries that will power the ring light for up to 70 minutes at full brightness.

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We chose these ring lights based on extensive research into the product sector. We combed through popular sites reading reviews (both good and bad) and noting the top-rated ring lights for different categories/needs. We considered brand, size, price, and brightness levels when making our final picks.

The smaller the focal length is, the wider the viewfinder range gets, and the wider the field of view of the captured picture will be. So more scenes can be captured, but the scene is very small in the picture.

ZDNET's recommendations are based on many hours of testing, research, and comparison shopping. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing.

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This ring light from Wescott will be your brightest option at 2,435 lumens. It has a CRI of up to 97, and color temperatures ranging from 3200K-5600K, resulting in soft, flattering lighting that fills face shadows and reflects catchlights in a subject's eyes.

Even though it is a smaller ring light size at 8 inches, it is the perfect size for making content that's close-range, or to light up your face while on a Zoom call.

The best ring lights for TikTok would be the Neweer light, the Westcott light, and the Lume Cube light. The best light size for Instagram Reels and TikTok videos are ideally 12-18 inches. These light options also have great color range and brightness settings perfect to light up your video content.

We all know that the imaging principle of camera is pinhole imaging, so in a digital camera, the focal length refers to the distance from the lens pinhole to the sensor, and the unit is mm (millimeter).

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That entirely depends on your preferences and what you will be using the ring light for. Generally speaking, the larger the ring light, the brighter it is. The 10- to 12-inch ring lights are more so considered "selfie lights" for headshots, while 14- to 18-inch ring lights would be great for situations while standing (especially if the light will be several feet away from you).

This light can reach 148 lumens at 3 feet -- that, coupled with its smaller 10-inch size makes it best for headshots or selfie lighting.

If there are two numbers marked on the lens, it means that it is a zoom lens, such as a 24-70mm lens, which means that the focal length of this lens can be adjusted freely between 24-70mm.