What is a mirror lens exactly? And have they got a new lease of life when used on mirrorless cameras? I've been trying them ...

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 ...

That measurement gives you an idea of the lens’s field of view and thus the magnification of the scene. Higher numbers give you a narrower field of view and more magnification; for example ...

With 10x magnification and a 50mm objective lens, the C.3s are made for seeing long distances and letting in ample light at dusk and dawn when most woodland creatures are active. This is also why ...

The best camera phones from Apple, Samsung, Google and OnePlus That's because the only way to decide which camera phone is best is to use the camera, take the photos, and compare them side-by-side ...

This book provides a systematic treatment of algebraic and topological properties of convex sets (possibly non-closed or unbounded) in the n-dimensional Euclidean space. Topics under consideration ...

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 ...

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 ...

Check out the best Canon RF lenses for whatever you shoot, whether you're a full frame or APS-C shooter (I've included the APS-C equivalent focal lengths for each suggestion, so you know how the ...

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