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。 D}X\Ca"h
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： _a T5jR=
Warning: At least 3 focal positions are recommended for finding best focus 3:i@II
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. )+ 2hl
Any MTF results are of questionable value for assessing LSr]S79N1
the image quality, except in those cases where the user is k\GcHI-
interested only in the image of a point-like object. The dlTt _.
image quality for the unacceptable fields varies significan- [HZv8HU|
tly over a lateral region of 12 Airy disk diameters. A~t
j/yq9
Warning: The MTF results at one or more fields are inaccurate. Z?m3~L9L2
The mapping between entrance pupil coordinates and exit pupil coordinates 6 ~w@PRy
is nonlinear. The nature of the nonlinearity is such that Code V is not (J FWna0@
able to compute an accurate MTF result. Usually, this condition is ?<'}r7D
caused by severe pupil distortion or some discontinuity in the pupil "1 M[5\Ax
coordinate mapping. In all cases where the pupil coordinate mapping rh}J3S5vp
has sufficient nonlinearity to cause this warning, the imagery is extremely U\*J9
nonstationary (non-isoplanatic) and small changes in object space ^$hH1H+V
coordinates will cause large changes in the image of a point source. V33T+P~j
Error: The problem described here occurs at the following field(s):
Z>5 b;8
Field: 1 B ,epzI
Field: 2 ut7 zVp<"
Field: 3 ^3L0w}#
Field: 4 SKsKPqz
ERROR - For field 4, wavelength 1, rays at the edge of the pupil N5b!.B x-w
may be ignored. Check apertures and vignetting for consistency. OYTkV}tG
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
