找到參考資料了。
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From Smith, Modern Lens Design, 2nd ED, page 4 l.juys8s
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Are aspheric surfaces free of aberration? H-W)Tq_?-
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have o~K 2K5I
no spherical aberration if the object point is at one focal point and the s*f.` A*)
image is at the other. But if we depart from this condition we definitely h~@+M5r,
do get spherical aberration. c
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