catadioptric telescope

catadioptric telescope

(kat-ă-dÿ-op -trik) A telescope that uses both refraction and reflection to form the image at the prime focus. By introducing a full-aperture correcting plate in front of the primary mirror, the telescope designer can correct many aberrations over an exceptionally wide field of view, in a way that combines the best features of both refracting and reflecting telescopes. See Schmidt telescope; Maksutov telescope.

Catadioptric Telescope


an optical instrument in which the image is constructed by a complex objective containing both mirrors and lenses. Correction lenses of comparatively small diameter are used in all modern reflectors to increase the effective field of view, but they are not classified as catadioptric telescopes. Only telescopes in which the lens elements are comparable in size to the primary mirror and are designed to correct the image (which is constructed by the primary mirror) may be said to be catadioptric. Among catadioptric telescopes are the Schmidt telescope (the Schmidt camera, 1931) and the Maksutov telescope (a meniscus telescope, 1941). In the Schmidt telescope aberrations of the spherical primary mirror are eliminated by means of a special correction plate of irregular configuration that is mounted in the entrance pupil. In the Maksutov telescope the aberrations of the primary spherical or elliptical mirror are corrected by a meniscus mounted in front of the mirror. Catadioptric telescopes of the super-Schmidt type (1947)—a combination of Schmidt systems with Maksutov meniscus systems—are used for observations of meteors and artificial earth satellites.

In reflectors of the Ritchey-Chrétien system, comparatively small lens correctors, which are installed in a converging beam in front of the focus of the telescope, are used. Such a corrector was first proposed in 1935 for the 5-m reflector of the Palomar Observatory (in the United States). However, in the narrow meaning of the term such systems are not catadioptric telescopes.


Maksutov, D. D. Astronomicheskaia optika. Moscow-Leningrad, 1946.


References in periodicals archive ?
If you're using a refractor or a catadioptric telescope, you can fashion a tube extension from a rolled-up newspaper or cardboard to prevent sunlight from falling directly onto the objective lens or corrector.
Instead of using a reflective telescope, which is common in bathymetric lidar, they designed a catadioptric telescope that uses mirrors and lenses to reflect and refract light.
If that describes you, consider a catadioptric telescope such as a Schmidt-Cassegrain.
Talks that day included Jim Hysom discussing a new type of catadioptric telescope and David Allen, a professional astronomer from Cambridge relating his recent observing trip to do infra-red astronomy with the 30-inch reflector of the Physics Department of the University of Minneapolis in Minnesota, USA.
The light from the scanning mirror is reflected into a Newtonian, catadioptric telescope system with a primary mirror and a lens to correct aberrations.
It's the catadioptric telescope, an extremely lightweight and compact design well suited for many terrestrial and extraterrestrial applications.
Choosing and Using a New CAT: Getting the Most from Your Schmidt-Cassegrain or Any Catadioptric Telescope
George Ritchey and Henri Chretien did not invent a catadioptric telescope incorporating both mirrors and lenses.
The lunar-orbit-insertion-burn segment of the diagram showing how Apollo astronauts got to the Moon has problems, the Encke Division in Saturn's rings is mislabeled, an illustration of the Sun erroneously shows sunspots at its poles, the descriptions and illustrations of a reflector and a catadioptric telescope are incorrectly paired, the giant elliptical galaxy M87 is misidentified in several places as M82, and a diagram explaining the seasons is exactly backward.
The year 2001 marks the 60th anniversary of the invention of the meniscus catadioptric telescope by this remarkable Russian optician.