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Schmidt telescope British & World English

A type of catadioptric telescope used solely for wide-angle astronomical photography, with a thin glass plate at the front to correct for spherical aberration. A curved photographic plate is placed at the prime focus inside the telescope

Schmidt–Cassegrain telescope British & World English

A type of catadioptric telescope, using the correcting plate of a Schmidt telescope together with the secondary mirror and rear focus of a Cassegrain telescope