找到參考資料了。 qmFG
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From Smith, Modern Lens Design, 2nd ED, page 4 ?OLd
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Are aspheric surfaces free of aberration? R|n
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have AY{KxCrb^
no spherical aberration if the object point is at one focal point and the lhKn&U
image is at the other. But if we depart from this condition we definitely d!E_EoOi
do get spherical aberration. HD^#"