找到參考資料了。 OZ'=Xtbn
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From Smith, Modern Lens Design, 2nd ED, page 4 FU~xKNr
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Are aspheric surfaces free of aberration? @+,J^[ y
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have Xc!0'P0T
no spherical aberration if the object point is at one focal point and the !MNnau%O
image is at the other. But if we depart from this condition we definitely YVpsf8R
do get spherical aberration. x?*)