小弟用CODEV設(shè)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。 *|mz_cKu  
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： Y2<dM/b/  
Warning: At least 3 focal positions are recommended for finding best focus yI8 SQ$w0y  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. K<FKu $

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               Any MTF results are of questionable value for assessing ! ,@ZQS  
               the image quality, except in those cases where the user is @0$}?2  
               interested only in the image of a point-like object.  The rJu[N(2k  
               image quality for the unacceptable fields varies significan- C1d 04
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               tly over a lateral region of 12 Airy disk diameters. 5.wiTy  
Warning: The MTF results at one or more fields are inaccurate. L[rpb.'FG  
               The mapping between entrance pupil coordinates and exit pupil coordinates Ls]@icH0  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not gI)u}JX  
               able to compute an accurate MTF result.  Usually, this condition is 9qpU@V!  
               caused by severe pupil distortion or some discontinuity in the pupil >9=:sSQu  
               coordinate mapping.  In all cases where the pupil coordinate mapping eK'wVg#  
               has sufficient nonlinearity to cause this warning, the imagery is extremely ! a