The Schmidt camera in its usual configuration is a corrector plate located at
the center of curvature of a spherical mirror, as shown in Fig. 4.10. This
arrangement was discussed in Section 4.5, where it was introduced to illustrate
the application of Fermat's Principle to cancel the on-axis aberration of the mirror
in collimated light. The importance of locating the aperture stop at the center of
curvature of the mirror to eliminate off-axis aberrations was also noted there.
In this section we extend these discussions and consider the Schmidt config-
uration in a mor
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