找到參考資料了。 %FFm[[nxI
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From Smith, Modern Lens Design, 2nd ED, page 4 7kpW1tjY
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Are aspheric surfaces free of aberration? < LAD
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have A1}+j-D7!y
no spherical aberration if the object point is at one focal point and the 4lUE(#kUM
image is at the other. But if we depart from this condition we definitely E!l1a5qB
do get spherical aberration. PR6uw