找到參考資料了。 yB-.sGu
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From Smith, Modern Lens Design, 2nd ED, page 4 CdX`PQ
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Are aspheric surfaces free of aberration? |n+#1_t%
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have 7<^'DOs
no spherical aberration if the object point is at one focal point and the .W!tveX8-
image is at the other. But if we depart from this condition we definitely pU
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do get spherical aberration. &(gm4bTg