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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
210 9. Auxiliary Optics for Telescopes
The coma due to the field flattener lens can be largely removed by reducing the
corrector-mirror separation by about 2%, but this displacement does not, of
course, affect the spherical aberration. For this example it turns out that higher-
order aberrations are not negligible. Fifth-order spherical aberration compensates
in part for third order and the result from ray tracing is an on-axis blur diameter of
about 1.4 arc-sec. This blur can be reduced to a negligible value by adding an
aspheric term of higher order to the corrector, as noted in Section 7.2.
Comparing the effects of
the
flattener lens in thes ...
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Publisher Resources

ISBN: 9780126298109