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。 fAF1"4f
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： AWcLUe {
Warning: At least 3 focal positions are recommended for finding best focus CJtcn_.F
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. 5 CuuG<0
Any MTF results are of questionable value for assessing /J ta^Bj
the image quality, except in those cases where the user is e4-@ f%5
interested only in the image of a point-like object. The FW.7'7G@n
image quality for the unacceptable fields varies significan- JR'
tly over a lateral region of 12 Airy disk diameters. w!#tTy k`
Warning: The MTF results at one or more fields are inaccurate. :X"?kK0 V
The mapping between entrance pupil coordinates and exit pupil coordinates xP_cQwm`1
is nonlinear. The nature of the nonlinearity is such that Code V is not i ky|Tp
able to compute an accurate MTF result. Usually, this condition is $ Y;U[_l#
caused by severe pupil distortion or some discontinuity in the pupil Y2| #V#
coordinate mapping. In all cases where the pupil coordinate mapping JELT o u
has sufficient nonlinearity to cause this warning, the imagery is extremely rUwZ Mli
nonstationary (non-isoplanatic) and small changes in object space 0;hqIJcE:\
coordinates will cause large changes in the image of a point source. :v0U|\j8/V
Error: The problem described here occurs at the following field(s): c>,KZ!
Field: 1 f0A{W/0n
Field: 2 XND|h#i8
Field: 3 Ha(c'\T (\
Field: 4 ,NOsFO-`<
ERROR - For field 4, wavelength 1, rays at the edge of the pupil dW)B1i Uo!
may be ignored. Check apertures and vignetting for consistency. yUeCc"Vf
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
