找到參考資料了。 vYQ0e:P
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From Smith, Modern Lens Design, 2nd ED, page 4 _b8&$\>
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Are aspheric surfaces free of aberration? jp=z
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have 4po zTe
no spherical aberration if the object point is at one focal point and the q5C(/@)^
image is at the other. But if we depart from this condition we definitely FG/". dU
do get spherical aberration. ^o&3 +s}M