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。 3[a&|!Yw
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： `yvH0B -
Warning: At least 3 focal positions are recommended for finding best focus 0o>l+c
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. F4#^jat{
Any MTF results are of questionable value for assessing Y~fa=R{W
the image quality, except in those cases where the user is H;=JqD 8`
interested only in the image of a point-like object. The kgQyG[u
image quality for the unacceptable fields varies significan- F s{}bQyQ
tly over a lateral region of 12 Airy disk diameters. O^_$cq
Warning: The MTF results at one or more fields are inaccurate. jx?"m=`s:
The mapping between entrance pupil coordinates and exit pupil coordinates Ibbpy++d[
is nonlinear. The nature of the nonlinearity is such that Code V is not jW!x!8=
able to compute an accurate MTF result. Usually, this condition is !L ({i')
caused by severe pupil distortion or some discontinuity in the pupil 0c,)T1NG >
coordinate mapping. In all cases where the pupil coordinate mapping V lk a+$4!
has sufficient nonlinearity to cause this warning, the imagery is extremely #A@d; U %
nonstationary (non-isoplanatic) and small changes in object space R oY"Haa
coordinates will cause large changes in the image of a point source. ]rY3bG'&
Error: The problem described here occurs at the following field(s): ^ g u;
Field: 1 SR<*yO
Field: 2 `+c8;p'q
Field: 3 Z4ZR]eD
Field: 4 IuW5LS
ERROR - For field 4, wavelength 1, rays at the edge of the pupil R3<2Z0lqy
may be ignored. Check apertures and vignetting for consistency. X^% E"{!nU
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
