\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

At Mobile World Congress 2025, Xiaomi showcased a Modular Optical System (MOS) that magnetically attaches a lens to a custom Xiaomi 15. It's like a Moto Mod, but with a full-fledged, working ...

Sony stole a lead on other manufacturers in the full-frame mirrorless market, and it’s had more time to build up a wide array of companion lenses to suit every need and budget. I've always been a big ...

Fujifilm was one of the first camera makers to embrace mirrorless systems and has one of the most well-established lens libraries. These are the best we've tested. Images, and the devices that ...

Learn more› By Erin Roberts We will soon update this guide to focus entirely on Canon RF-mount mirrorless lenses, following the structure of our Nikon Z-mount lens guide. Keep an eye out for new ...

If you’re new to contact lenses, you may have questions about how to wear and care for them. It may not be as simple as slipping on a pair of eyeglasses. And it may take longer to get used to them.

Eye health company Bausch & Lomb is recalling some of its intraocular lenses over possible safety concerns. The voluntary recall comes after the company “received reports of complications ...

Canon has announced the RF 20mm F1.4 L VCM ultra-wide prime as part of its L-series "hybrid" prime lenses designed for both stills and video work. Recent Videos The 20mm F1.4 shares many ...

Our lens reviews offer detailed information on sharpness, distortion, bokeh, and all the other important factors that go into making a lens great. Our reviews give you all the information you need ...

To see if $50 could bridge this gap, I recently bought an anamorphic lens for my smartphone, and took it for a spin in both London and Australia. I've used anamorphic lenses on actual video ...

With the compact camera craze driving up prices, pairing a mirrorless camera with a pancake lens is a viable and sometimes even more affordable alternative to getting a small camera. Sony E-Mount ...

That's why we've made this article, which we'll keep updated throughout the year with all the cameras, lenses, and other pieces of gear that we've used. We got to test Canon's latest fast, wide-angle ...