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).

Light path in an Argunov–Cassegrain telescope

Discussion

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

• Klevtsov–Cassegrain telescope
• List of telescope types

References

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

• Kudzej, I.; Karetnikov, V.G.; Dubovsky, P.A.; et al. (2007). "Astronomical observatory at Kolonické Sedlo and its results in variable stars observing". Odessa Astronomical Publications. 20: 100–105.
• Kudzej, I.; Dubovsky, P.A. (December 2010). "One-meter telescope in Kolonica Saddle – 4 years of operation" (PDF). Odessa Astronomical Publications. 23: 70–73. Bibcode:2010OAP....23...70K – via Harvard U. ADS.

External links

• "Astrokolonica page". Archived from the original on 30 May 2014.
• "Astronomical Observatory on Kolonica Saddle". Archived from the original on 8 June 2016.