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。 8h#/b1\  
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： F-k3F80=  
Warning: At least 3 focal positions are recommended for finding best focus Zq--m/  
Warning: This system is not isoplanatic at field(s)  1, 2, 3, 4. Gv!* Qk4  
               Any MTF results are of questionable value for assessing %<oey%ue  
               the image quality, except in those cases where the user is mk;l;!*T8  
               interested only in the image of a point-like object.  The 1X4v:rI  
               image quality for the unacceptable fields varies significan- wyk4v}  
               tly over a lateral region of 12 Airy disk diameters. #KonVM(`  
Warning: The MTF results at one or more fields are inaccurate. DdTTWp/  
               The mapping between entrance pupil coordinates and exit pupil coordinates uhFj|r$$  
               is nonlinear.  The nature of the nonlinearity is such that Code V is not T3o}%wGW  
               able to compute an accurate MTF result.  Usually, this condition is )j40hrR  
               caused by severe pupil distortion or some discontinuity in the pupil <aR8fU  
               coordinate mapping.  In all cases where the pupil coordinate mapping .pgTp X  
               has sufficient nonlinearity to cause this warning, the imagery is extremely K YFumR