找到參考資料了。 ~).D\Q\
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From Smith, Modern Lens Design, 2nd ED, page 4 *OFG3 uM
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Are aspheric surfaces free of aberration? X`Q+,tx$
`}=R
The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have 2m yxwA5
no spherical aberration if the object point is at one focal point and the D0 p*Sg
image is at the other. But if we depart from this condition we definitely 9ABU^ig
do get spherical aberration. o|z@h][(l(