A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.

(photography, optics, informal) A type of flat lens design.

(photography) A short focal length lens having a wide field of view.

(photography) Synonym of macro lens

Alternative form of fisheye lens

A cosmetic contact lens that makes the eyes' irises appear larger, popular in East Asia.

(photography) Denoting or relating to a type of camera which allows the photographer to view the subject through the same lens that will be used to take a photograph, usually by incorporating a moving mirror and prism.

(photography) Abbreviation of single-lens reflex camera.

(photography) A telephoto lens

(optics) A lens that is designed to minimize spherical aberration.