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Schmidt telescope

noun
1.
a catadioptric telescope designed to produce a very sharp image of a large area of sky in one photographic exposure. It incorporates a thin specially shaped glass plate at the centre of curvature of a short-focus spherical primary mirror so that the resulting image, which is focused on a photographic plate, is free from spherical aberration, coma, and astigmatism
Word Origin
C20: named after B. V. Schmidt (1879–1935), Estonian-born German inventor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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