Argunov–Cassegrain telescope

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Light path in an Argunov–Cassegrain telescope

The Argunov–Cassegrain telescope is a catadioptric telescope design first introduced in 1972 by P. P. Argunov.[1][2] 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).

Discussion[edit]

Argunov systems only employ spherical surfaces and avoid the practical difficulties of making and testing aspheres. However, this 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 aspheric surface with comparable precision.[citation needed] Further, since multiple surfaces are involved, creating a design with good aberration correction can become very complicated.[3]

See also[edit]

References[edit]

  1. ^ Argunov, P.P. (1972). "Izokhromaticheskie sistemy teleskopov so sfericheskoi optikoi" [Isochromatic telescope designs with spherical optics]. Astronomicheskij Vestnik. 6 (1): 52–61.
  2. ^ "Catadioptric telescopes". Sky Gazette. 6 March 2016. Retrieved 19 February 2018.
  3. ^ Sacek, Vladimir. "Catadioptric telescopes". telescope-optics.net. Notes on amateur telescope optics. 10.2.1.

Further reading[edit]

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