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。 s_IFl5D]
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： DX>LB$dy?
Warning: At least 3 focal positions are recommended for finding best focus -6kX?sNl)X
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. PKrG6%
W+
Any MTF results are of questionable value for assessing >j hcSvM6
the image quality, except in those cases where the user is :p/=KI_
interested only in the image of a point-like object. The %Tp
k1
image quality for the unacceptable fields varies significan- `mz}D76~#
tly over a lateral region of 12 Airy disk diameters. ue@/o,C>
Warning: The MTF results at one or more fields are inaccurate. GEc-< `-
The mapping between entrance pupil coordinates and exit pupil coordinates 18rV Acj
is nonlinear. The nature of the nonlinearity is such that Code V is not ="& GU%$
able to compute an accurate MTF result. Usually, this condition is !<:Cd(bM
caused by severe pupil distortion or some discontinuity in the pupil RxYENG]/6
coordinate mapping. In all cases where the pupil coordinate mapping IeYNTk &<
has sufficient nonlinearity to cause this warning, the imagery is extremely Twa(RjB<
nonstationary (non-isoplanatic) and small changes in object space l+"p$iZs
coordinates will cause large changes in the image of a point source. Rh^@1{yr
Error: The problem described here occurs at the following field(s): P ljPhAce
Field: 1 !?JZ^/u
Field: 2 qr%N /7
Field: 3 |JIlp"[
Field: 4 ~Yk^(hl2
ERROR - For field 4, wavelength 1, rays at the edge of the pupil 3Jizv,?
may be ignored. Check apertures and vignetting for consistency. Wn@oG@}~
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
