找到參考資料了。 F^i3e31*t
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From Smith, Modern Lens Design, 2nd ED, page 4 yk+ 50/L
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Are aspheric surfaces free of aberration? N'Gq9A
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have V>@[\N[
no spherical aberration if the object point is at one focal point and the [BWq9uE
image is at the other. But if we depart from this condition we definitely o<`vh*U@,4
do get spherical aberration. `+7F H