找到參考資料了。 *1ID`o
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From Smith, Modern Lens Design, 2nd ED, page 4 w>9H"Q[
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Are aspheric surfaces free of aberration? L_.xr
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have @y;tk$e
no spherical aberration if the object point is at one focal point and the Y|x6g(b
image is at the other. But if we depart from this condition we definitely 'EH
do get spherical aberration. SS45<!iy