Exact optics – II. Exploration of designs on- and off-axis

The two-mirror telescopes/cameras that have no coma, no spherical aberration and arbitrarily fast focal ratios form a two-parameter (s, K) family of exact optical designs analytically derived earlier. We explore the full range of these designs in the s–K plane. Here s is the mirror separation/focal...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2003-06, Vol.342 (1), p.33-49
Main Authors: Willstrop, R. V., Lynden-Bell, D.
Format: Article
Language:English
Subjects:
instrumentation: spectrographs
telescopes
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Summary:The two-mirror telescopes/cameras that have no coma, no spherical aberration and arbitrarily fast focal ratios form a two-parameter (s, K) family of exact optical designs analytically derived earlier. We explore the full range of these designs in the s–K plane. Here s is the mirror separation/focal length and K is the distance from secondary to focus/focal length. Besides perfect-focus analogues of most well-known telescope designs, there are families of spectrograph cameras, X-ray telescopes and solar furnaces. Systems with s= 2 have minimum astigmatism and have exceptionally good images.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2003.06434.x