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。 ^,t@HN;gA
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： \%bJXTK&W
Warning: At least 3 focal positions are recommended for finding best focus U6*[}W w
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. r}^1dO
Any MTF results are of questionable value for assessing b S gbvnJ
the image quality, except in those cases where the user is :dRC$?f4
interested only in the image of a point-like object. The Ovj^
7r:<s
image quality for the unacceptable fields varies significan- TXXG0 G
tly over a lateral region of 12 Airy disk diameters. s :BW}PM
Warning: The MTF results at one or more fields are inaccurate. @1gU Rx&2_
The mapping between entrance pupil coordinates and exit pupil coordinates ? daxb
is nonlinear. The nature of the nonlinearity is such that Code V is not {:VK} w
able to compute an accurate MTF result. Usually, this condition is
N- &ZaK
caused by severe pupil distortion or some discontinuity in the pupil D)DD 6
coordinate mapping. In all cases where the pupil coordinate mapping ceD6q~)
has sufficient nonlinearity to cause this warning, the imagery is extremely T U2oQ1
nonstationary (non-isoplanatic) and small changes in object space /Z!$b D
coordinates will cause large changes in the image of a point source. CDXN%~0h
Error: The problem described here occurs at the following field(s): XksI .]tfj
Field: 1 }o7- 3!{L!
Field: 2 izGU&VeB
Field: 3 _G @Z n[v
Field: 4 L(u@%.S
ERROR - For field 4, wavelength 1, rays at the edge of the pupil }7b{ZbDI
may be ignored. Check apertures and vignetting for consistency. 3!/J!X3L
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
