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。 =-n}[Y}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： e6$W Qd`O
Warning: At least 3 focal positions are recommended for finding best focus f r6 fj
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. h3
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Any MTF results are of questionable value for assessing M APGJ"?
the image quality, except in those cases where the user is c`w}|d]mC
interested only in the image of a point-like object. The Iit; F
image quality for the unacceptable fields varies significan- f 6>b |k~
tly over a lateral region of 12 Airy disk diameters. B[?Ng}<g`
Warning: The MTF results at one or more fields are inaccurate. )Y{L&A
The mapping between entrance pupil coordinates and exit pupil coordinates V {ddr:]4
is nonlinear. The nature of the nonlinearity is such that Code V is not FWgpnI\X|{
able to compute an accurate MTF result. Usually, this condition is S;#'M![8
caused by severe pupil distortion or some discontinuity in the pupil h MD|#A-<
coordinate mapping. In all cases where the pupil coordinate mapping -k e' s
has sufficient nonlinearity to cause this warning, the imagery is extremely >_ T-u<E
nonstationary (non-isoplanatic) and small changes in object space )1`0PJoHE
coordinates will cause large changes in the image of a point source. >!1-lfa8
Error: The problem described here occurs at the following field(s): tFOhL9T
Field: 1 Bt n]}8K
Field: 2 Z,Dl` w
Field: 3 I:1C8*/
Field: 4 1^JS Dd
ERROR - For field 4, wavelength 1, rays at the edge of the pupil .Vvx,>>D
may be ignored. Check apertures and vignetting for consistency. #?- wm
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
