找到參考資料了。 @>Y.s6a  
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From Smith, Modern Lens Design, 2nd ED, page 4 i3bH^WwE&k  
 zX{O"w  
Are aspheric  surfaces free of aberration? bC_qoI<   
 2YT1]x 3  
The conic aspherics (e.g., paraboloid,  ellipsoid, hyperboloid, and the sphere) have >o=O^:/L  
no spherical  aberration  if the object point is at one focal point and the qH#?,	sK ^  
image is at the other. But if we depart  from this condition we definitely #&fi[|%X$  
do get spherical  aberration. 6n[O8^