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Cassegrain focus

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Cassegrain focus: see telescope telescope, 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;
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Cassegrain focus [kas·gran ′fō·kəs]
(optics)
The principal focus of a Cassegrain telescope, located just behind the primary mirror.
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Placing a wide to medium telephoto lens piggyback on a serious amateur telescope like my C-8 allows use of the clock drive to minimize star trailing, while the lens of a 35mm camera is almost always both "faster" and more contrasty than the C-8 telescope, which at Cassegrain focus is a 2000mm f/10 lens.
Comet shooting by Roy, James R. / PSA Journal
 
 
 
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