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。 1}a4AGAp
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： KWY _eY_|
Warning: At least 3 focal positions are recommended for finding best focus 3<W%z]k@M
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. gm)Uyr$
Any MTF results are of questionable value for assessing LE<J<~2Z
the image quality, except in those cases where the user is exhU ! p8
interested only in the image of a point-like object. The !\ 4B.
image quality for the unacceptable fields varies significan- 7?R600O A
tly over a lateral region of 12 Airy disk diameters. PhC3 F4
Warning: The MTF results at one or more fields are inaccurate. w1"+H Jd
The mapping between entrance pupil coordinates and exit pupil coordinates ;9OhK71}
is nonlinear. The nature of the nonlinearity is such that Code V is not -:ucp2
able to compute an accurate MTF result. Usually, this condition is b`- |7<s
caused by severe pupil distortion or some discontinuity in the pupil *z VN6wG{
coordinate mapping. In all cases where the pupil coordinate mapping z w+aZDcV(
has sufficient nonlinearity to cause this warning, the imagery is extremely =p'+kS+
nonstationary (non-isoplanatic) and small changes in object space b&F9<X Lqq
coordinates will cause large changes in the image of a point source. RJ3oI+g I
Error: The problem described here occurs at the following field(s): ;`#R9\C=h
Field: 1 A! bG 2{r
Field: 2 /dYv@OU?
Field: 3 P'U2hCif
Field: 4 X-HE9PT.
ERROR - For field 4, wavelength 1, rays at the edge of the pupil pjFO0h_Y
may be ignored. Check apertures and vignetting for consistency. d{4;qM#
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
