[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。 Re'Ek  
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： D{s4Bo-  
Warning: At least 3 focal positions are recommended for finding best focus \ffU15@N  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. Uc|MfxsL  
               Any MTF results are of questionable value for assessing kA&ul  
               the image quality, except in those cases where the user is |}K7Q  
               interested only in the image of a point-like object.  The v:@ud,d<  
               image quality for the unacceptable fields varies significan- ~uu~NTz  
               tly over a lateral region of 12 Airy disk diameters. 58_aI?~>>  
Warning: The MTF results at one or more fields are inaccurate. F6#U31Q=  
               The mapping between entrance pupil coordinates and exit pupil coordinates $6\W8v  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not 7j%sM&  
               able to compute an accurate MTF result.  Usually, this condition is &8 4Izs/[  
               caused by severe pupil distortion or some discontinuity in the pupil TZk.h8  
               coordinate mapping.  In all cases where the pupil coordinate mapping Dv+:d4|"  
               has sufficient nonlinearity to cause this warning, the imagery is extremely l
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               nonstationary (non-isoplanatic) and small changes in object space =u]FKY  
               coordinates will cause large changes in the image of a point source. 2E}^'o  
Error: The problem described here occurs at the following field(s): *gXm&/2*  
                           Field:  1 w'Q2Czso  
                           Field:  2 ;V3d"@R,  
                           Field:  3 NbW5a3=  
                           Field:  4 \R
vsy;7  
     ERROR - For  field  4, wavelength  1, rays at the edge of the pupil b1qli
5  
             may be ignored. Check apertures and vignetting for consistency. "Q<*H<e  
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？ \M`fkR,,'  
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