找到參考資料了。 .Tc?9X~4
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From Smith, Modern Lens Design, 2nd ED, page 4 ":^cb =
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Are aspheric surfaces free of aberration? ACH!Gw~
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have ptpu
u=3"
no spherical aberration if the object point is at one focal point and the oz?6$oE(bt
image is at the other. But if we depart from this condition we definitely {qBbzBG
do get spherical aberration. N Z~"2~Hh