
7.2.
Characteristics of Aspheric Plate 167
corrector, the corrector is larger and its chromatic effects are also larger. To
minimize the chromatic effects, therefore, the pupil should be at the corrector or
as close as can be arranged. We discuss the relation between the pupil location
and the chromatic effect in a following section.
7.2.
CHARACTERISTICS OF ASPHERIC PLATE
The aspheric plate is obviously the key to a correctly configured Schmidt
system and we now consider its aberration characteristics in some detail. In this
section we consider the finite thickness of a real plate and its effect on the
aberrations, and the effect of the radiu ...