小弟用CODEV设计了一个开普勒望远镜。目镜用的是对称式，物镜用了一个双胶合，视觉放大率为12。 [O_5`X9|
在目镜和物镜分别优化之后，将二者组合在一起时发现Quick 2D能正常显示，但是MTF图线无法显示，有报错，如下： R||$Rfe
Warning: At least 3 focal positions are recommended for finding best focus Wq}6RdY$ZA
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. }15&<s
Any MTF results are of questionable value for assessing ~gZ1*8 s`
the image quality, except in those cases where the user is By7l Sbj
interested only in the image of a point-like object. The (NR( )2
image quality for the unacceptable fields varies significan- l
7dm@S
tly over a lateral region of 12 Airy disk diameters. i.O n{nB"k
Warning: The MTF results at one or more fields are inaccurate. `fEzE\\!*
The mapping between entrance pupil coordinates and exit pupil coordinates Q!IqvmO
is nonlinear. The nature of the nonlinearity is such that Code V is not yxpv;v:)=
able to compute an accurate MTF result. Usually, this condition is dT 7f yn
caused by severe pupil distortion or some discontinuity in the pupil MNe/H\
coordinate mapping. In all cases where the pupil coordinate mapping xV14Y9
has sufficient nonlinearity to cause this warning, the imagery is extremely r]\[G6mE%
nonstationary (non-isoplanatic) and small changes in object space wY\,b*x
coordinates will cause large changes in the image of a point source. *(r9c(x a
Error: The problem described here occurs at the following field(s): Y+23 jlgb
Field: 1 O!dS;p-F
Field: 2 Ofoh4BL'1@
Field: 3 ynMYf
Field: 4 PuZzl%i
P3
ERROR - For field 4, wavelength 1, rays at the edge of the pupil KV;q}EyG
may be ignored. Check apertures and vignetting for consistency. R|qNyNXo[
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
