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。 c<r`E
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： % j^[%&pT
Warning: At least 3 focal positions are recommended for finding best focus %o.{h
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. #x" 4tI
Any MTF results are of questionable value for assessing GCkc[]2p
the image quality, except in those cases where the user is 4Fgy<^94`
interested only in the image of a point-like object. The zQV$!%qR
image quality for the unacceptable fields varies significan- v 1 d]
tly over a lateral region of 12 Airy disk diameters. k?o(j/
Warning: The MTF results at one or more fields are inaccurate. .ss/E
The mapping between entrance pupil coordinates and exit pupil coordinates !6'j
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is nonlinear. The nature of the nonlinearity is such that Code V is not A=Q"IdK
able to compute an accurate MTF result. Usually, this condition is D"El6<3)h
caused by severe pupil distortion or some discontinuity in the pupil % TyR8
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coordinate mapping. In all cases where the pupil coordinate mapping iL\<G}
I
has sufficient nonlinearity to cause this warning, the imagery is extremely 1;i[H[hNY
nonstationary (non-isoplanatic) and small changes in object space LBk1Qw}-
coordinates will cause large changes in the image of a point source. P`v%<
9~
Error: The problem described here occurs at the following field(s): GE\@mu *pO
Field: 1 5lu620o
Field: 2 ^ D/:[
Field: 3 / ~'ZtxA
Field: 4 3gQQ,V..
ERROR - For field 4, wavelength 1, rays at the edge of the pupil dBE
:rZu
may be ignored. Check apertures and vignetting for consistency. ]6v6&YV
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
