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。 $ sEe0
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： ({ ![
Warning: At least 3 focal positions are recommended for finding best focus ix^:qw;
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. `(=)8>|e
Any MTF results are of questionable value for assessing 0$ &Z_oJ
the image quality, except in those cases where the user is ^]wm Y
interested only in the image of a point-like object. The -+|0LXo
image quality for the unacceptable fields varies significan- $a\q<fN}
tly over a lateral region of 12 Airy disk diameters. A`#v-
Warning: The MTF results at one or more fields are inaccurate. S7wZCQe
The mapping between entrance pupil coordinates and exit pupil coordinates &4"(bZ:LO
is nonlinear. The nature of the nonlinearity is such that Code V is not t> &$_CSWK
able to compute an accurate MTF result. Usually, this condition is ?Pl>sCFm~
caused by severe pupil distortion or some discontinuity in the pupil `;*=2M<c
coordinate mapping. In all cases where the pupil coordinate mapping CJjma=XH
has sufficient nonlinearity to cause this warning, the imagery is extremely }?*:uf
nonstationary (non-isoplanatic) and small changes in object space xi;SKv;p
coordinates will cause large changes in the image of a point source. ErB6fl
Error: The problem described here occurs at the following field(s): aChY 5R
Field: 1 ,0<|&D
Field: 2 nT|fDD|
Field: 3 zfi{SO
l
Field: 4 4s`*o/it
ERROR - For field 4, wavelength 1, rays at the edge of the pupil XpOsnvW
may be ignored. Check apertures and vignetting for consistency. L4.yrA-]C%
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
