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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
120
6. Reflecting Telescopes
shows that coma is almost always the aberration that sets the limiting field size for
good images, as the reader can verify by constructing a diagram similar to that of
Fig. 6.1. Spot diagrams for an//10 Cassegrain with m = 4 and j8 = 0.25 are
shown in Fig. 6.2. The images for a classical Gregorian are very similar.
Looking at the curvature of the median image surface in the case j8
==
0, we
see that it is approximately 2(m + l)/Ri. This relation is not exact, but it
illustrates three features of the image surface. First, the sign of K^ is opposite
for the Cassegrain and Gregorian types; the surface of best image ...
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Publisher Resources

ISBN: 9780126298109