
172 7. Schmidt Telescopes and Cameras
Substituting Eq. (7.2.8) into Eqs. (7.2.7), and assuming that
W2
«: R^ for all
configurations using an aspheric plate, we find the following aberration coeffi-
cients for the corrector:
_e\n-i) be'
-?(-.-0.
_ en(n -I) ^bO
(^1-^), (7.2.9)
_ b . n\n - 1)
Substituting Eq. (7.2.4) for one R^ in
^3^
of Eqs. (7.2.9), we find that the right-
hand term is of order (r^/R^) smaller than the first term. For any practical plate
TQ
<^ Re and the right-hand term in
^3^
is negligible.
For the remaining coefficients in Eq. (7.2.9) we see that the contribution of the
aspheric term in each is zero when W^ = t/n. The remainin ...