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。 xf% _HMKc
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： x- 1RmL_%
Warning: At least 3 focal positions are recommended for finding best focus zk#"n&u0
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. G)t_;iNL|
Any MTF results are of questionable value for assessing r$T\@oTL
the image quality, except in those cases where the user is V"K-aO&
interested only in the image of a point-like object. The n@[_lNa4GD
image quality for the unacceptable fields varies significan- Vsw] v
tly over a lateral region of 12 Airy disk diameters. ]{ ^'{ z$i
Warning: The MTF results at one or more fields are inaccurate. ?71?Vd
The mapping between entrance pupil coordinates and exit pupil coordinates l1HMH?0|
is nonlinear. The nature of the nonlinearity is such that Code V is not xq$(=WPI
able to compute an accurate MTF result. Usually, this condition is tpPP5C{
caused by severe pupil distortion or some discontinuity in the pupil $lVR6|n
coordinate mapping. In all cases where the pupil coordinate mapping o^+2%S`]
has sufficient nonlinearity to cause this warning, the imagery is extremely rZ'&'#Q
nonstationary (non-isoplanatic) and small changes in object space Sqn|
coordinates will cause large changes in the image of a point source. 'o}v{f
Error: The problem described here occurs at the following field(s): Fj;] ;1nt
Field: 1 1*U)\vK~
Field: 2 e<A6= }
Field: 3 #!?jxfsFa
Field: 4 n#$sLXVy
ERROR - For field 4, wavelength 1, rays at the edge of the pupil h @AKfE!\~
may be ignored. Check apertures and vignetting for consistency. .bYZkO:oy
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
