Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-05
Astron.Lett. 31 (2005) 129-139; Erratum-ibid. 31 (2005) 357
Astronomy and Astrophysics
Astrophysics
19 pages
Scientific paper
10.1134/1.1862353
It is shown that the theory of aplanatic two-mirror telescopes developed by Karl Schwarzschild in 1905 leads to the unified description both the prefocal and the postfocal systems. The class of surfaces in the ZEMAX optical program has been properly extended to ascertain the image quality in exact Schwarzschild aplanats. A comparison of Schwarzschild aplanats with approximate Ritchey-Chretien and Gregory-Maksutov aplanatic telescopes reveals a noticeable advantage of the former at fast focal ratio of the system.
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