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。 bUt?VR}P(
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： aB.`'d)V
Warning: At least 3 focal positions are recommended for finding best focus -3A#a_fu
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. +h"RXwlBM
Any MTF results are of questionable value for assessing |:C =j/f
the image quality, except in those cases where the user is V#zDYrp
interested only in the image of a point-like object. The ygh*oVHO
image quality for the unacceptable fields varies significan- D{~I
tly over a lateral region of 12 Airy disk diameters. WI ' ;e4
Warning: The MTF results at one or more fields are inaccurate. {2A/ @$?
The mapping between entrance pupil coordinates and exit pupil coordinates 7i`8 c =.
is nonlinear. The nature of the nonlinearity is such that Code V is not p3&w/K{L6w
able to compute an accurate MTF result. Usually, this condition is \f .ceh;!
caused by severe pupil distortion or some discontinuity in the pupil ZdfIe~Oni
coordinate mapping. In all cases where the pupil coordinate mapping mJl|dk_c
has sufficient nonlinearity to cause this warning, the imagery is extremely |d&a&6U:
nonstationary (non-isoplanatic) and small changes in object space ULj'DzlfH
coordinates will cause large changes in the image of a point source. ex1b j M7
Error: The problem described here occurs at the following field(s): 1 %K^( J;
Field: 1 [;%qxAB/_
Field: 2 #)z_T M07P
Field: 3 lUbQ@7a<'
Field: 4 <GT&q <4w
ERROR - For field 4, wavelength 1, rays at the edge of the pupil ZBi|B D
may be ignored. Check apertures and vignetting for consistency. j' g': U
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
