找到參考資料了。 pAYH"Q6~)I
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From Smith, Modern Lens Design, 2nd ED, page 4 IBWUeB:b
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Are aspheric surfaces free of aberration? Xz0jjO,
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have U6"U^
no spherical aberration if the object point is at one focal point and the N
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image is at the other. But if we depart from this condition we definitely )kl| 5i
do get spherical aberration. H>e?FDs0*R