[求助]求CODEV中MTF图线不能显示的原因 [复制链接]

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。 #iZ%CY\  
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： Q5!"tFp  
Warning: At least 3 focal positions are recommended for finding best focus yjq~O~  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. !yfQ^a_
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               Any MTF results are of questionable value for assessing A,WZ}v}_  
               the image quality, except in those cases where the user is FHoY=fCI  
               interested only in the image of a point-like object.  The QcXqMx  
               image quality for the unacceptable fields varies significan- =9LeFrz  
               tly over a lateral region of 12 Airy disk diameters. f{[]m(X;  
Warning: The MTF results at one or more fields are inaccurate. 6)@Y41H]C  
               The mapping between entrance pupil coordinates and exit pupil coordinates 3lZ5N@z69  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not C}7c:4c  
               able to compute an accurate MTF result.  Usually, this condition is !_ng_,J  
               caused by severe pupil distortion or some discontinuity in the pupil :X66[V&eH  
               coordinate mapping.  In all cases where the pupil coordinate mapping ;q3"XLV(T[  
               has sufficient nonlinearity to cause this warning, the imagery is extremely 3BSJ|o<"=  
               nonstationary (non-isoplanatic) and small changes in object space &:}{?vU  
               coordinates will cause large changes in the image of a point source. 7I_1Lnnf  
Error: The problem described here occurs at the following field(s): IpRdGT02  
                           Field:  1 [VsTyqV a  
                           Field:  2 ~zcHpxO^W  
                           Field:  3 }H>}v/  
                           Field:  4 wcd1.$ n  
     ERROR - For  field  4, wavelength  1, rays at the edge of the pupil hm&cRehU  
             may be ignored. Check apertures and vignetting for consistency. #
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这个究竟是什么问题呢？好像是和视场有关。求高人指点。

1、是无焦模式吗？ {tN?)~ZQ  
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

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。

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

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

多谢指点，虽然不知道为什么，但是图线出来了。

非常好的，谢谢

学习 学习！

系统没有衔接好，看看na epd等

codev初学，学习了