找到參考資料了。 *}J_STM
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From Smith, Modern Lens Design, 2nd ED, page 4 l0_V-|x
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Are aspheric surfaces free of aberration? >O _
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have V*aTDU%-.
no spherical aberration if the object point is at one focal point and the 3XRG"
image is at the other. But if we depart from this condition we definitely $enh45Wy
do get spherical aberration. 9 2EMDKJ