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Schmidt–Cassegrain telescope
The Schmidt–Cassegrain is a catadioptric telescope that combines a Cassegrain reflector's optical path with a Schmidt corrector plate to make a compact astronomical instrument that uses simple spherical surfaces.
==Invention and design==
The astronomer and lens designer James Gilbert Baker first proposed a Cassegrain design for Bernhard Schmidt's Schmidt camera in 1940.〔The General History of Astronomy, Volume 2, Part 2, Cambridge University Press -1984, page 177〕 The optical shop at Mount Wilson Observatory manufactured the first one during World War II as part of their research into optical designs for the military.〔( Abrahams, P., The Mount Wilson Optical Shop during the Second World War, American Astronomical Society Meeting 205, #02.01; Bulletin of the American Astronomical Society, Vol. 36, p.1339 )〕 As in the Schmidt camera this design uses a spherical primary mirror and a Schmidt corrector plate to correct for spherical aberration. In this Cassegrain configuration the convex secondary mirror acts as a field flattener and relays the image through the perforated primary mirror to a final focal plane located behind the primary. Some designs include additional optical elements (such as field flatteners) near the focal plane. The first large telescope to use the design was the James Gregory Telescope at the University of St Andrews.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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