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Two-mirror aplanatic telescopes with a flat field

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Abstract

A complete description is given of two-mirror telescopes with a flat medial focal surface, on which the images of stars are circles of least confusion. Particular attention is paid to aplanats, since their field of view is noticeably larger than that of classical systems. Two sets of appropriate solutions correspond to Schwarzschild and Gregorian telescopes. As a result, it becomes possible to use flat light detectors with wide-field two-mirror telescopes. New designs are of particular interest when as few reflective surfaces as possible are required, which is typical for space exploration and non-optical observations.

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Notes

  1. Recall that the effective focal length F of an optical system is measured from the back principal plane to the focal plane. Therefore, the negativity of F, as is the case for the Gregorian system, means that the back focal plane is located farther behind the focus along the optical axis. To facilitate the use of various sources, we give the relationship between the Schroeder [4] and Maksutov [6, 7] variables: \(m_{Schr} = 1/\beta = m\), \(\beta _{Schr} = q(1+1/\beta )-1\).

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Acknowledgements

I am grateful to the anonymous Referee for helpful comments.

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  1. Crimean Astrophysical Observatory, Nauchny, Ukraine

    V. Yu. Terebizh

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  1. V. Yu. Terebizh
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Correspondence to V. Yu. Terebizh.

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Terebizh, V.Y. Two-mirror aplanatic telescopes with a flat field. Exp Astron 53, 1075–1083 (2022). https://doi.org/10.1007/s10686-022-09833-0

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  • DOI: https://doi.org/10.1007/s10686-022-09833-0

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