找到參考資料了。 3Agyp89}Q
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From Smith, Modern Lens Design, 2nd ED, page 4 !! )W`
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Are aspheric surfaces free of aberration? 2`%a[t@M.
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have i~AReJxt7
no spherical aberration if the object point is at one focal point and the 0*9xau{(
image is at the other. But if we depart from this condition we definitely [Y?Y@x"MZ
do get spherical aberration. ?FUK_]