
5.6. Aberrations for Multisurface Systems 93
5.5.C. EXAMPLES
At this point it is appropriate to illustrate the aberration relations with two
examples. Our choices are a sphere and a paraboloid, each illuminated with
collimated light, hence m = 0. We assume no aspheric component and set b = 0.
For the sphere we find A^ = B^ = n/4R^, hence we expect that both
B2
and Bi
will depend on the stop position. Inspection of the coefficients in Table 5.6 shows
that this is the case. When W = R, both
B2
and
B^
are zero; this stop position is
the starting point for the Schmidt camera.
Taking a sphere in collimated light with an aspheric component, we find ...