找到參考資料了。 _0"s6D$
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From Smith, Modern Lens Design, 2nd ED, page 4 `wKd##v'@
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Are aspheric surfaces free of aberration? H @5dj}
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have W#kd[Wi
no spherical aberration if the object point is at one focal point and the HsKq/Oyk
image is at the other. But if we depart from this condition we definitely 5Zn: $?7
do get spherical aberration. 5O[\gd-