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.

Cassegrain focus

[kas·gran ′fō·kəs]
(optics)
The principal focus of a Cassegrain telescope, located just behind the primary mirror.
References in periodicals archive ?
I was very pleased the first time I attached a Mintron MTV-12V1-EX at the f/10 Cassegrain focus of my 914-inch Celestron Ultima in order to view the globular cluster M13 on an adjacent 5-inch black-and-white monitor.
A pit under the telescope allowed the observer convenient access to a broken Cassegrain focus (one that is deflected to the side of the telescope tube by a diagonal mirror placed in front of the primary).
With it they could form a sharp image directly at the prime focus or, with the help of a convex secondary, at the Cassegrain focus.