找到參考資料了。 r{Qs9
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From Smith, Modern Lens Design, 2nd ED, page 4 Cu)%s
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Are aspheric surfaces free of aberration? Q
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have Pq[0vZ_}dN
no spherical aberration if the object point is at one focal point and the e"v[)b++Y
image is at the other. But if we depart from this condition we definitely 4z-,M7iP
do get spherical aberration. ei|*s+OZu