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

Harvard engineers unveiled the world's first visible-spectrum metasurfaces—ultra-thin, flat devices patterned with nanoscale structures that could precisely control the behavior of light. A powerful ...

Capturing precise 3D details with a single camera has long been a challenge. Traditional methods often require complex ...

Metasurfaces have the potential to fundamentally improve optical systems in our everyday lives. By controlling light more precisely, they drive compact, multi-functional solutions. Researchers have ...

For centuries, optical systems have relied on bulky, curved lenses made of glass or plastic to bend and focus light. The SEAS-led metasurface revolution of the last decade has produced flat ...

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 ...

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 ...

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 ...

Jeremy Agbonifo (Lens) left footed shot from the right side of the six yard box is close, but misses to the right. Assisted by Anass Zaroury with a cross. Attempt missed. M'Bala Nzola (Lens ...