\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) 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 ...

Whether you’re a full-time wearer or only need them occasionally, there’s no point crying over shattered lenses; it’s time for pragmatism to kick in and find a replacement. Don’t know ...

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 ...

The result is “The Art of Dressing: Dressing Like an Artist,” an exhibition of 200 artworks and fashion items that explores how these two creative worlds circle, intersect and inspire each ...

A quick $130 mod for recording in a 21:9 aspect ratio. GoPro is now shipping the new Anamorphic Lens Mod for its Hero 13 Black camera, which allows creators to record in a wider field of view ...

Abstract: In this paper, we propose a model predictive control (MPC) algorithm using sequential convex programming (SCP) to address concave inequality constraints. Based on traditional SCP, we ...

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 ...

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 ...