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。 ^z`d 2it
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： %'uei4
Warning: At least 3 focal positions are recommended for finding best focus 4,0 8`5{
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 1N[9\Yi
Any MTF results are of questionable value for assessing }_B Ni;H
the image quality, except in those cases where the user is u9m ~1\R*
interested only in the image of a point-like object. The O!il TMr
image quality for the unacceptable fields varies significan- h1H$3TpP
tly over a lateral region of 12 Airy disk diameters. Jj/}GVNc7
Warning: The MTF results at one or more fields are inaccurate. Z,tHyy F?j
The mapping between entrance pupil coordinates and exit pupil coordinates ik](k"1{
is nonlinear. The nature of the nonlinearity is such that Code V is not ^T*!~K8A
able to compute an accurate MTF result. Usually, this condition is V r@tSc&
caused by severe pupil distortion or some discontinuity in the pupil Qz89=#W
coordinate mapping. In all cases where the pupil coordinate mapping Ob {Tn@
has sufficient nonlinearity to cause this warning, the imagery is extremely 6RG63+G
nonstationary (non-isoplanatic) and small changes in object space vjzG
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coordinates will cause large changes in the image of a point source. `-JVz{z
Error: The problem described here occurs at the following field(s): W] WH4.y
Field: 1 9 p,O>I
Field: 2 AB{zkEuK
Field: 3 zwU1(?]I{
Field: 4 Xr:s-L
ERROR - For field 4, wavelength 1, rays at the edge of the pupil xs& xcR R"
may be ignored. Check apertures and vignetting for consistency. dBwoAq`'
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
