Cassegrain focus


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Related to Cassegrain focus: Coude Focus, Reflecting telescopes

Cassegrain focus:

see telescopetelescope,
traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it. Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of
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Cassegrain focus

See Cassegrain configuration.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Cassegrain focus

[kas·gran ′fō·kəs]
(optics)
The principal focus of a Cassegrain telescope, located just behind the primary mirror.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The original GMT primary mirrors had a focal length of 366 inches (f/7.625); at the f/41.5 Cassegrain focus, the effective focal length (EFL) was 1,994 inches.
Anyone wishing to use the CPC for CCD imaging at fast f/ratios will therefore require a focal reducer at the Cassegrain focus.
The scope can be used photographically at its f/3 prime focus (focal length 71 inches) and f/8 Cassegrain focus (189 inches).