找到參考資料了。 j-\^
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From Smith, Modern Lens Design, 2nd ED, page 4 x[<#mt
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Are aspheric surfaces free of aberration? c;fyUi
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have 2H0q\zZ
no spherical aberration if the object point is at one focal point and the &S`'o%B
image is at the other. But if we depart from this condition we definitely XsCbJ[Z_?q
do get spherical aberration. Z)>a6s$ih<