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+J0!FVla
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： P ]i
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Warning: At least 3 focal positions are recommended for finding best focus l{VSb92f
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. )RYG %
Any MTF results are of questionable value for assessing $
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the image quality, except in those cases where the user is ~^ ^ NHq
interested only in the image of a point-like object. The c9j*n;Q
image quality for the unacceptable fields varies significan- /H:I 68~
tly over a lateral region of 12 Airy disk diameters. jKZt~I
Warning: The MTF results at one or more fields are inaccurate. f'q 28lVf
The mapping between entrance pupil coordinates and exit pupil coordinates >xA),^ YT
is nonlinear. The nature of the nonlinearity is such that Code V is not Z?J:$of*
able to compute an accurate MTF result. Usually, this condition is {B*W\[ns
caused by severe pupil distortion or some discontinuity in the pupil ^v9|%^ug
coordinate mapping. In all cases where the pupil coordinate mapping ]O{u tm
has sufficient nonlinearity to cause this warning, the imagery is extremely zq1mmFIO
nonstationary (non-isoplanatic) and small changes in object space e4I^!5)N
coordinates will cause large changes in the image of a point source. g\GdkiI j
Error: The problem described here occurs at the following field(s): ~|wos-nM
Field: 1 hF3&i=;.
Field: 2 s cdtWA
Field: 3 0)9"M.AIvo
Field: 4 ?3Ij*}_O2
ERROR - For field 4, wavelength 1, rays at the edge of the pupil \ n9A^v`F/
may be ignored. Check apertures and vignetting for consistency. y [O-pD`
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
