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。 l?GN& u
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： &?C%
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Warning: At least 3 focal positions are recommended for finding best focus 60p*$Vqy
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. :H($|$\h
Any MTF results are of questionable value for assessing 0Snl_@s
the image quality, except in those cases where the user is Zd G?fWWA
interested only in the image of a point-like object. The 9NX f~-V-
image quality for the unacceptable fields varies significan- {"hX_t
tly over a lateral region of 12 Airy disk diameters. Q${0(#Nu
Warning: The MTF results at one or more fields are inaccurate. 1}nrVn[B9
The mapping between entrance pupil coordinates and exit pupil coordinates *9.4AW~]X
is nonlinear. The nature of the nonlinearity is such that Code V is not V ':?rEN|
able to compute an accurate MTF result. Usually, this condition is '|
(#^jAj
caused by severe pupil distortion or some discontinuity in the pupil Xm,w.|dx
coordinate mapping. In all cases where the pupil coordinate mapping @vzv9c[
has sufficient nonlinearity to cause this warning, the imagery is extremely 40,u(4.m*
nonstationary (non-isoplanatic) and small changes in object space a{*r^m'N
coordinates will cause large changes in the image of a point source. CqHCJ '
Error: The problem described here occurs at the following field(s): trD-qi
Field: 1 #mu3`,9V
Field: 2 m/}(dT ;
Field: 3 2MS-e}mi
Field: 4 ?Pg{nlJvq
ERROR - For field 4, wavelength 1, rays at the edge of the pupil :: IAXGH )
may be ignored. Check apertures and vignetting for consistency. Z,~Bz@5`"
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
