Pertaining to, produced by, or involving, both the reflection and refraction of light; as, a catadioptric light.

An optical system containing both reflective and refractive elements.

Telescope design using a combination of mirrors and lenses. More compact than reflectors of similar apertures. Common types include Schmidt-Cassegrain, Maksutov-Cassegrain, Schmidt-Newtonian, Maksutov-Newtonian, etc.

Any of a number of compromise telescope designs, using both a lens and mirrors. Examples are the Schmidt-Cassegrain and Maksutov-Cassegrain. Because the light path is folded twice, the telescope is very compact. These are pretty expensive. Pictures can be seen in the ads in any issue of a popular astronomy magazine: the Meade 2080 and the Celestron C-8 are examples of Schmidt-Cassegrain; the Celestron C-90 and Questar are examples of Maksutov-Cassegrain.

A telescope whose optics, not including the eyepiece, consists of both lenses and mirrors. The most common examples of these are the Schmidt-Cassegrain telescopes, whose "lens" is an aspheric corrector plate, and the Maksutov-Cassegrain telescopes, whose "lens" is a deeply curved meniscus.

Referring to an optical system which uses both reflection (mirrors) and refraction (lenses). This also describes the unwanted effect of lens elements reflecting images inside a compound camera lens. Undesirable catadioptric effects include ghosting and lens flares.

(also spelt catadioptic): Reflecting telescope, so-called because the beam of light is 'folded', i.e. reflected, back through a hole in the main mirror, before reaching the eyepiece. The effect is to increase the telescope's focal length, thus producing a more portable but also costlier instrument. Catadioptrics use a lens-like correcting plate in the front for spherical aberration. The commonest types are the Schmidt-Cassegrain and Maksutov-Cassegrain.

A combination of reflecting and refracting components.

A telescope that uses a system incorporating both lenses and mirrors to form an image. Common types: Schmidt-Cassegrain (SCT) and Maksutov-Cassegrain (MCT, mak) telescopes.

The term catadioptric refers to optical systems which involve both lenses and mirrors. Catadioptric systems are commonly used in telescopes and in lightweight, long focus lenses for cameras.