Photonics Dictionary

A lens that has one convex surface and the other concave.

A lens with one surface convex and the other concave, the latter having the greater curvature. It also is known as a diverging meniscus lens.

See periscopic lens; rapid rectilinear lens.

A lens with one concave surface and one convex surface; synonymous with meniscus.

A converging lens with one convex and one concave surface.

The process of grinding the concave surface of a single-vision spherical lens.

A telescope objective with excellent spherochromatic correction, consisting of a meniscus crown and a meniscus flint, both convex to the long conjugate.

A thick meniscus lens arranged concentric with the center of curvature of a spherical mirror to produce an image free of spherical aberration.

A double-surfaced catadioptric spherical mirror whose spherical first surface consists of a negative meniscus (concave) lens and second rear surface is a spherical mirror. This combination utilizes...

An anastigmatic lens with a thick meniscus construction that flattens the field and corrects chromatic and spherical aberration.

Two simple meniscus lenses arranged symmetrically on either side of the aperture stop, providing reduced coma, lateral color and distortion.

A double meniscus system in which two achromatized meniscus lenses are arranged symmetrically on either side of the aperture stop, reducing or eliminating distortion, coma and lateral color.

A photographic objective that uses the thick meniscus principle to obtain its power. It is designed to photograph small fields at large apertures.

A meniscus that is often fitted before a camera lens to permit focusing on near objects.