The technical definition of a telephoto lens is one with a focal length greater (or longer) than 50mm (on the 35mm/full frame forma), but the telephoto range is more generally accepted to begin at ...

Kenko has announced the second version of its 400mm f/8 telephoto mirror lens. The new version features optical tweaks to improve image quality, compared to the previous model (which came out in July ...

We may earn revenue from the products available on this page and participate in affiliate programs. Learn more › Believe it. Adoram’s ProOptic 500mm f/6.3 ($160, direct; adorama.com) shares all the ...

A new Kickstarter project is aiming to create a 360-degree GoPro lens through a concept so simple that store clerks have been using it for years to see around aisle corners: a curved mirror. The ...

[Robb] has had a little experience making lenses from scratch. His first attempt was for a DIY projector, and while the lens was a little blurry, it did work rather well for something carved out of a ...