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。 FE" y\2}
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： )64@2 ~4y
Warning: At least 3 focal positions are recommended for finding best focus
zG+R5:
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. dG@"! !,
Any MTF results are of questionable value for assessing )X04K ~6lY
the image quality, except in those cases where the user is vQ<90Z xqB
interested only in the image of a point-like object. The f5F@^QXQ
image quality for the unacceptable fields varies significan- 0MV>"aV
tly over a lateral region of 12 Airy disk diameters. ^?$WVB
Warning: The MTF results at one or more fields are inaccurate. *ohL& 'y
The mapping between entrance pupil coordinates and exit pupil coordinates CQwL|$)]Y
is nonlinear. The nature of the nonlinearity is such that Code V is not 5'0xz.) !
able to compute an accurate MTF result. Usually, this condition is U ?'vXa
caused by severe pupil distortion or some discontinuity in the pupil A3vUPWdDk
coordinate mapping. In all cases where the pupil coordinate mapping |M8WyW
has sufficient nonlinearity to cause this warning, the imagery is extremely t(GR)&>.2
nonstationary (non-isoplanatic) and small changes in object space ktnuNsp
coordinates will cause large changes in the image of a point source. 3VuW#m#j
Error: The problem described here occurs at the following field(s): {)DHH:n
Field: 1 }>)@WL:q
Field: 2 JB ZUv
Field: 3 gWrgnlq
Field: 4 tS|9fBdCs
ERROR - For field 4, wavelength 1, rays at the edge of the pupil Q F-LU
may be ignored. Check apertures and vignetting for consistency. 1?)Xp| O
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
