找到參考資料了。 ~;OYtz
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From Smith, Modern Lens Design, 2nd ED, page 4 h2;z4
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Are aspheric surfaces free of aberration? )g@S%Yu
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have ^Ori|
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no spherical aberration if the object point is at one focal point and the b~C$R[S
image is at the other. But if we depart from this condition we definitely q 'a
do get spherical aberration. v)kEyX'K2d