[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。 qPoN 8>.  
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： #7['M;_  
Warning: At least 3 focal positions are recommended for finding best focus -CLBf'a  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. y;<F|zIm  
               Any MTF results are of questionable value for assessing ~'v9/I-"  
               the image quality, except in those cases where the user is _F
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               interested only in the image of a point-like object.  The 6u>]-K5  
               image quality for the unacceptable fields varies significan- DM,)nh6'  
               tly over a lateral region of 12 Airy disk diameters. Y.kgJ #2  
Warning: The MTF results at one or more fields are inaccurate. JFFluL=-  
               The mapping between entrance pupil coordinates and exit pupil coordinates Zm*qV!  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not V{UY_ e8W  
               able to compute an accurate MTF result.  Usually, this condition is =SD^Jl{H  
               caused by severe pupil distortion or some discontinuity in the pupil Jq?Fi'2F%  
               coordinate mapping.  In all cases where the pupil coordinate mapping 6bN8}\5  
               has sufficient nonlinearity to cause this warning, the imagery is extremely gY!?JZC-0  
               nonstationary (non-isoplanatic) and small changes in object space  JKV&c=I  
               coordinates will cause large changes in the image of a point source. Ot`znJU@  
Error: The problem described here occurs at the following field(s): 2N{^V?:  
                           Field:  1 fcO|0cQ  
                           Field:  2 055C1RV%  
                           Field:  3 .$fSWlM;  
                           Field:  4 cx]H8]ch7  
     ERROR - For  field  4, wavelength  1, rays at the edge of the pupil u|LDN*#DW  
             may be ignored. Check apertures and vignetting for consistency. ?j&ZzK'#^  
这个究竟是什么问题呢？好像是和视场有关。求高人指点。

这个是不是因为系统的几个视场焦对不到一起去

codev初学，学习了

系统没有衔接好，看看na epd等

学习 学习！

非常好的，谢谢

多谢指点，虽然不知道为什么，但是图线出来了。

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

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

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。