A telephoto lens.

(photography) A lens which produces an image similar in detail and angular perspective to the view produced by the human eye, as distinct from a wide-angle lens or a telephoto lens.

(photography) A lens having a long focal length which produces a magnified view of distant objects.

(photography) A wide-angle lens having an extremely wide field of view (approaching or exceeding 180 degrees) and producing images that are circular or distorted by curvature at the edges.

Circle contact lens.

(photography) The detachable cap that protects the camera lens when the camera is not in use.

The hollow cylindrical lens used in the Fresnel lantern.

A microscopic objective of short focal distance designed to work with a drop of liquid between the front lens and the slide, so that this lens is practically immersed.

A large lens constructed in several parts or layers, extending in a series of annular rings beyond the central lens, and used in lighthouses.

(microscopy) A condensing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the "spot"), and used in darkfield illumination.