求CODEV中MTF图线不能显示的原因

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。
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：
Warning: At least 3 focal positions are recommended for finding best focus
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4.
               Any MTF results are of questionable value for assessing
               the image quality, except in those cases where the user is
               interested only in the image of a point-like object.  The
               image quality for the unacceptable fields varies significan-
               tly over a lateral region of 12 Airy disk diameters.
Warning: The MTF results at one or more fields are inaccurate.
               The mapping between entrance pupil coordinates and exit pupil coordinates
               is nonlinear.  The nature of the nonlinearity is such that Code V is not
               able to compute an accurate MTF result.  Usually, this condition is
               caused by severe pupil distortion or some discontinuity in the pupil
               coordinate mapping.  In all cases where the pupil coordinate mapping
               has sufficient nonlinearity to cause this warning, the imagery is extremely
               nonstationary (non-isoplanatic) and small changes in object space
               coordinates will cause large changes in the image of a point source.
Error: The problem described here occurs at the following field(s):
                           Field:  1
                           Field:  2
                           Field:  3
                           Field:  4
     ERROR - For  field  4, wavelength  1, rays at the edge of the pupil
             may be ignored. Check apertures and vignetting for consistency.
这个究竟是什么问题呢？好像是和视场有关。求高人指点。

lixun201	2012-05-17 20:21
1、是无焦模式吗？ hXn@vK6 2、MTF最大设置成多少了？一般无焦的到2已经很NB了。具体不讲了，多看看CODE V相关的资料

imissyoumg	2012-05-18 14:11
我是初学，把镜头数据输入后，得到的结果和楼主一样，无法做出mtf。

ljwcdtj	2012-05-18 16:49
望远镜设计是要无焦的吧?MTF设置了40,但是物镜和目镜分别优化时都是没问题的啊

lixun201	2012-05-18 17:34
设置成无焦模式后，把mtf的最大值改成1，具体原因求哥们好好学习，个人能力有限，怕解释不清楚

ljwcdtj	2012-05-19 10:48
多谢指点，虽然不知道为什么，但是图线出来了。

漫语	2012-05-22 17:16
非常好的，谢谢

jinlai	2013-11-25 10:50
学习学习！

jinlai	2014-01-09 10:31
系统没有衔接好，看看na epd等

yanzhiyan	2017-12-26 15:13
codev初学，学习了

sjtuchenyuan	2018-01-02 16:05
这个是不是因为系统的几个视场焦对不到一起去

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