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。
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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： gz88$BT
Warning: At least 3 focal positions are recommended for finding best focus =]^* -f}J9
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. ; w+A38N$J
Any MTF results are of questionable value for assessing @-7K~in?^
the image quality, except in those cases where the user is 'shO SB
interested only in the image of a point-like object. The NH?s
image quality for the unacceptable fields varies significan- x##Iv|$
tly over a lateral region of 12 Airy disk diameters. wY=ky629
Warning: The MTF results at one or more fields are inaccurate. I{2 e0
The mapping between entrance pupil coordinates and exit pupil coordinates ud.S,
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is nonlinear. The nature of the nonlinearity is such that Code V is not %"z W]
able to compute an accurate MTF result. Usually, this condition is ypsCyDQK`
caused by severe pupil distortion or some discontinuity in the pupil Q vqBT
coordinate mapping. In all cases where the pupil coordinate mapping }tJ:-!*2
has sufficient nonlinearity to cause this warning, the imagery is extremely @9L%`=]b^
nonstationary (non-isoplanatic) and small changes in object space Npu;f>g0_
coordinates will cause large changes in the image of a point source. ` n _ Z
Error: The problem described here occurs at the following field(s): ` ^6}Dn
Field: 1 /TB_4{
Field: 2 `=\G>#p<T
Field: 3 w |M?t{
Field: 4 Ii
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ERROR - For field 4, wavelength 1, rays at the edge of the pupil d- ]%
may be ignored. Check apertures and vignetting for consistency. VVf~ULZ-
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
