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。 60PYCqWc
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： )BLmoJOf
Warning: At least 3 focal positions are recommended for finding best focus wItz cY1m
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. hEOJb
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Any MTF results are of questionable value for assessing k,]{NO
the image quality, except in those cases where the user is .
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interested only in the image of a point-like object. The NgxO&Zp
image quality for the unacceptable fields varies significan- bOXh|u_3i
tly over a lateral region of 12 Airy disk diameters. *|'}v[{v^9
Warning: The MTF results at one or more fields are inaccurate. +" =~o5k3Q
The mapping between entrance pupil coordinates and exit pupil coordinates cdsQ 3o
is nonlinear. The nature of the nonlinearity is such that Code V is not dofR)"<p,^
able to compute an accurate MTF result. Usually, this condition is y h-9u
caused by severe pupil distortion or some discontinuity in the pupil Gg +Y fY_
coordinate mapping. In all cases where the pupil coordinate mapping `Kp}s<
has sufficient nonlinearity to cause this warning, the imagery is extremely @Z2/9K%1'
nonstationary (non-isoplanatic) and small changes in object space vs* I7 <
coordinates will cause large changes in the image of a point source. <4NQL*|>
Error: The problem described here occurs at the following field(s): b-b;7a\N
Field: 1 w:R]!e_6\9
Field: 2 nDn{zea7
Field: 3 !:J< pWN"
Field: 4 ,CW%JIM
ERROR - For field 4, wavelength 1, rays at the edge of the pupil *]9XDc]{j1
may be ignored. Check apertures and vignetting for consistency. p;ZDpR
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
