Matches in DBpedia 2015-10 for { ?s ?p "The Argunov Cassegrain telescope is a catadioptric telescope design first introduced in 1972 by P. P. Argunov. All optics are spherical, and the classical Cassegrain secondary mirror is replaced by a sub-aperture secondary corrector group consisting of three air-spaced elements, two lenses and a Mangin mirror (the element farthest from the primary mirror). Argunov systems only employ spherical surfaces and avoid the practical difficulties of making and testing aspheres."@en }
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- Argunov–Cassegrain_telescope comment "The Argunov Cassegrain telescope is a catadioptric telescope design first introduced in 1972 by P. P. Argunov. All optics are spherical, and the classical Cassegrain secondary mirror is replaced by a sub-aperture secondary corrector group consisting of three air-spaced elements, two lenses and a Mangin mirror (the element farthest from the primary mirror). Argunov systems only employ spherical surfaces and avoid the practical difficulties of making and testing aspheres.".