找到參考資料了。 dk[MT'DV
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From Smith, Modern Lens Design, 2nd ED, page 4 Kk|4
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Are aspheric surfaces free of aberration? \@F~4,VT
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have R!y`p:O
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no spherical aberration if the object point is at one focal point and the G/y;o3/[Z
image is at the other. But if we depart from this condition we definitely "*JyNwf
do get spherical aberration. uB>OS1=