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。 %M N>b[z
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： LtBm }0
Warning: At least 3 focal positions are recommended for finding best focus %5 ?0+~
Warning: This system is not isoplanatic at field(s) 1, 2, 3, 4. j'FBt8P'
Any MTF results are of questionable value for assessing ?I#zcD)w
the image quality, except in those cases where the user is l@%7]
0!T
interested only in the image of a point-like object. The 3)qtz_,H/g
image quality for the unacceptable fields varies significan- {\-IAuM
tly over a lateral region of 12 Airy disk diameters. 7o64|@ 'j
Warning: The MTF results at one or more fields are inaccurate. ~r>N
The mapping between entrance pupil coordinates and exit pupil coordinates 9Dy/-%Ut9
is nonlinear. The nature of the nonlinearity is such that Code V is not |Ok1E
able to compute an accurate MTF result. Usually, this condition is _6F j&mw(u
caused by severe pupil distortion or some discontinuity in the pupil YQ<O .E
coordinate mapping. In all cases where the pupil coordinate mapping las|ougLy
has sufficient nonlinearity to cause this warning, the imagery is extremely 1)wzSEV@
nonstationary (non-isoplanatic) and small changes in object space D|!^8jHj
coordinates will cause large changes in the image of a point source. 2qUC@d<K
Error: The problem described here occurs at the following field(s): K) t+ lJ
Field: 1 B (dq$+4
Field: 2 p[- bu B]
Field: 3 }c*6|B@f
Field: 4 0sKY;(
ERROR - For field 4, wavelength 1, rays at the edge of the pupil -|xyj2M
may be ignored. Check apertures and vignetting for consistency. nA ^UF_rD-
这个究竟是什么问题呢？好像是和视场有关。求高人指点。
