
144 6. Reflecting Telescopes
Angular
ASA
ATC
Table 6.16
Aberrations for Despaced Secondary"'*
RC
0.912
0.252
AG
0.846
0.174
''dk =
ds2/fx
=0.001.
*
Aberrations are given in units of arc-seconds,
ATC is given at a field angle of 18 arc-min, and
parameters of telescopes are given in Table 6.10.
conclusion was already noted here for secondary misalignments. In general, a
telescope with a faster primary is more sensitive to alignment errors of any kind.
The calculation of coma introduced by a despaced secondary proceeds in a
similar way. We start with the coma coefficient ^2^ in Table 6.6 and ATC from
Table 6.7, express all variables in terms o ...