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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
6.2. Two-Mirror Telescopes
125
telescope, the so-called Couder, therefore suffers from the problem that the focal
surface is relatively inaccessible. For a reasonable choice of m, say 0.25, it also
has a relatively large secondary obscuration compared to the Ritchey-Chretien.
One final thing to note is that the telescope focal length, in general, is one-half the
distance between the primary and secondary mirrors. A diagram of a Couder
design is shown in Fig. 6.4.
Another type of anastigmatic aplanat is found if the primary is convex and
A:
> 1. From Eq. (6.2.6) we find m < 0, hence there is a real final focus and the
configuration is that o ...
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Publisher Resources

ISBN: 9780126298109