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。 a 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： /=/Ki%hh
Warning: At least 3 focal positions are recommended for finding best focus =WY'n
l'
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 29RP$$gR
Any MTF results are of questionable value for assessing _K~h?
\u
the image quality, except in those cases where the user is AYA{_^#+3
interested only in the image of a point-like object. The $5&%X'jk
image quality for the unacceptable fields varies significan- #4'wF4DR@
tly over a lateral region of 12 Airy disk diameters. ls
5iE
Warning: The MTF results at one or more fields are inaccurate. yQ[;y~W
The mapping between entrance pupil coordinates and exit pupil coordinates 46 A sD
is nonlinear. The nature of the nonlinearity is such that Code V is not R#d~a;j
able to compute an accurate MTF result. Usually, this condition is C:J;'[,S
caused by severe pupil distortion or some discontinuity in the pupil +H2Jhgi
coordinate mapping. In all cases where the pupil coordinate mapping X=$Jp.
has sufficient nonlinearity to cause this warning, the imagery is extremely .c"nDCFVR
nonstationary (non-isoplanatic) and small changes in object space :]-oo*xP
coordinates will cause large changes in the image of a point source. K.)!qkW-%S
Error: The problem described here occurs at the following field(s): b0$)G-E/Y
Field: 1 Q*smH-Sw
Field: 2 2^WJ 1: A
Field: 3 k5S;G"i J
Field: 4 8 c8`"i
ERROR - For field 4, wavelength 1, rays at the edge of the pupil j?.F-ar
may be ignored. Check apertures and vignetting for consistency. jfxNV2[
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
