找到參考資料了。 gXJ^o;R>M  
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From Smith, Modern Lens Design, 2nd ED, page 4 0z#kV}wE  
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Are aspheric  surfaces free of aberration? )&<ExJQ&  
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The conic aspherics (e.g., paraboloid,  ellipsoid, hyperboloid, and the sphere) have @E;pT3; )  
no spherical  aberration  if the object point is at one focal point and the e6'O,\  
image is at the other. But if we depart  from this condition we definitely ! 
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do get spherical  aberration. 3Q)>gh*