找到參考資料了。 n#BvW,6J
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From Smith, Modern Lens Design, 2nd ED, page 4 ~wOTjz
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Are aspheric surfaces free of aberration? 03EV%Vc
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have 6\4Z\82
no spherical aberration if the object point is at one focal point and the
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image is at the other. But if we depart from this condition we definitely yl$F~e1W
do get spherical aberration. GRT]aw