找到參考資料了。 `TPIc
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From Smith, Modern Lens Design, 2nd ED, page 4 Es+I]o0K
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Are aspheric surfaces free of aberration?
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have G*4I;'6
no spherical aberration if the object point is at one focal point and the VFf;|PHS
image is at the other. But if we depart from this condition we definitely L?/AKg
do get spherical aberration. fM ID}S