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。 dSkM A
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：
Z /RSZ-
Warning: At least 3 focal positions are recommended for finding best focus ~7ZWt g;B
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. EV/DJ$ C }
Any MTF results are of questionable value for assessing <- L}N '
the image quality, except in those cases where the user is 1R-WJph
interested only in the image of a point-like object. The yw\Q>~$n[=
image quality for the unacceptable fields varies significan- zc K`hS
tly over a lateral region of 12 Airy disk diameters. Zjd9@
Warning: The MTF results at one or more fields are inaccurate. l|v`B6(
The mapping between entrance pupil coordinates and exit pupil coordinates a5cary Z"z
is nonlinear. The nature of the nonlinearity is such that Code V is not Q`kV|
pjg
able to compute an accurate MTF result. Usually, this condition is $t0o*i{
caused by severe pupil distortion or some discontinuity in the pupil X lLG/N
coordinate mapping. In all cases where the pupil coordinate mapping DaP,3>M
has sufficient nonlinearity to cause this warning, the imagery is extremely !y+uQ_IS@
nonstationary (non-isoplanatic) and small changes in object space 52ExRG S
coordinates will cause large changes in the image of a point source. F/V -@SF
Error: The problem described here occurs at the following field(s): w$iQ,--
Field: 1 |yS %
Field: 2 >
9.%hSy
Field: 3 'h R0JXy
Field: 4 F_G .$a Cc
ERROR - For field 4, wavelength 1, rays at the edge of the pupil (1 (~r"4I
may be ignored. Check apertures and vignetting for consistency. Hsn'"
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
