Argunov–Cassegrain telescope
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. However, this seeming benefit is marginal, as it is almost as difficult to make a true, zone-free sphere of precise radius of curvature as it is to make an asphere of equivalent precision. Also since multiple surfaces are involved, creating a design with good aberration correction can be very complex.
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Argunov–Cassegrain telescope
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. However, this seeming benefit is marginal, as it is almost as difficult to make a true, zone-free sphere of precise radius of curvature as it is to make an asphere of equivalent precision. Also since multiple surfaces are involved, creating a design with good aberration correction can be very complex.
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The Argunov Cassegrain telesco ...... orrection can be very complex.
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阿古諾夫-卡塞格林望遠鏡的設計是在1972年由P.P. 阿古 ...... 製做,它需要精確的自由區域球的曲率半徑以取代等效的非球面鏡。
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The Argunov Cassegrain telesco ...... orrection can be very complex.
@en
阿古諾夫-卡塞格林望遠鏡的設計是在1972年由P.P. 阿古 ...... 製做,它需要精確的自由區域球的曲率半徑以取代等效的非球面鏡。
@zh
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Argunov–Cassegrain telescope
@en
阿古諾夫-卡塞格林望遠鏡
@zh