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。 C"k8 M\RW?
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： V!3G\*$?
Warning: At least 3 focal positions are recommended for finding best focus pnca+d
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. y&t&'l/m
Any MTF results are of questionable value for assessing E,shTh%&~
the image quality, except in those cases where the user is P9 :7_Vc
interested only in the image of a point-like object. The hUSr1jlA
image quality for the unacceptable fields varies significan- #p&i H9c_
tly over a lateral region of 12 Airy disk diameters. %bZ3^ ub}t
Warning: The MTF results at one or more fields are inaccurate. s#&jE
GBug
The mapping between entrance pupil coordinates and exit pupil coordinates k )Z?
is nonlinear. The nature of the nonlinearity is such that Code V is not Xp1xhb*^
able to compute an accurate MTF result. Usually, this condition is RR{]^g51
caused by severe pupil distortion or some discontinuity in the pupil pwT|T;j*
coordinate mapping. In all cases where the pupil coordinate mapping (3 8.s:-
has sufficient nonlinearity to cause this warning, the imagery is extremely y mY,*Rb
nonstationary (non-isoplanatic) and small changes in object space 8^\DQ& D
coordinates will cause large changes in the image of a point source. &.an-
Error: The problem described here occurs at the following field(s): vlw2dY@^
Field: 1 Of7j~kdh83
Field: 2 ScQJ sFE6
Field: 3 ]n${j/ x
Field: 4 8*=N\'m],
ERROR - For field 4, wavelength 1, rays at the edge of the pupil rVzj LkN^
may be ignored. Check apertures and vignetting for consistency. )_ NQ *m
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
