小弟用CODEV設計了一個開普勒望遠鏡。目鏡用的是對稱式，物鏡用了一個雙膠合，視覺放大率為12。 =ohdL_6  
在目鏡和物鏡分別優(yōu)化之后，將二者組合在一起時發(fā)現(xiàn)Quick 2D能正常顯示，但是MTF圖線無法顯示，有報錯，如下： 'VF9j\a  
Warning: At least 3 focal positions are recommended for finding best focus >:wk.<Z-  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. \6@}HFH  
               Any MTF results are of questionable value for assessing \ &_ -  
               the image quality, except in those cases where the user is WddU|-W  
               interested only in the image of a point-like object.  The  i4Fw+Z  
               image quality for the unacceptable fields varies significan- B`KpaE]  
               tly over a lateral region of 12 Airy disk diameters. $1UN?(r  
Warning: The MTF results at one or more fields are inaccurate. oA42?I ^  
               The mapping between entrance pupil coordinates and exit pupil coordinates t$UFR7XE  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not mXa1SZnE
 
               able to compute an accurate MTF result.  Usually, this condition is Gzm[4|nO^  
               caused by severe pupil distortion or some discontinuity in the pupil xp,H5 m%  
               coordinate mapping.  In all cases where the pupil coordinate mapping *4.f*3*  
               has sufficient nonlinearity to cause this warning, the imagery is extremely ,~G[\2~p  
               nonstationary (non-isoplanatic) and small changes in object space ZY]
[LU~l8  
               coordinates will cause large changes in the image of a point source. uHwuw_eK`  
Error: The problem described here occurs at the following field(s): 1lx\Pz@ol  
                           Field:  1 b!UT<:o  
                           Field:  2 NG