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。 _xnJfW_
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： J/PK #<
Warning: At least 3 focal positions are recommended for finding best focus 15%6;K?b
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. ] cMZ7V^
Any MTF results are of questionable value for assessing LLoV]~dvUu
the image quality, except in those cases where the user is Cu<' b'%;
interested only in the image of a point-like object. The U!YoZ?
image quality for the unacceptable fields varies significan- !)05,6WQ
tly over a lateral region of 12 Airy disk diameters. f"^t~q[VS
Warning: The MTF results at one or more fields are inaccurate. j HObWUX
The mapping between entrance pupil coordinates and exit pupil coordinates @X=sfyg k
is nonlinear. The nature of the nonlinearity is such that Code V is not L x iN9
able to compute an accurate MTF result. Usually, this condition is D&] x Kx
caused by severe pupil distortion or some discontinuity in the pupil /;xrd\du
coordinate mapping. In all cases where the pupil coordinate mapping vG=Pi'4XXo
has sufficient nonlinearity to cause this warning, the imagery is extremely NGZtlNvh
nonstationary (non-isoplanatic) and small changes in object space *z_`$Y
coordinates will cause large changes in the image of a point source. =F dFLrx~l
Error: The problem described here occurs at the following field(s): e-.( O8
Field: 1 h]IoH0 /
Field: 2 UF@.
Field: 3 S& ;)F|-q
Field: 4 579 t^"ja~
ERROR - For field 4, wavelength 1, rays at the edge of the pupil Y^|15ek
may be ignored. Check apertures and vignetting for consistency. Z&h :3;
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
