找到參考資料了。 {?X +Yw
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From Smith, Modern Lens Design, 2nd ED, page 4 uOZSX.o^
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Are aspheric surfaces free of aberration? NvpDi&i
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The conic aspherics (e.g., paraboloid, ellipsoid, hyperboloid, and the sphere) have y\dx \
no spherical aberration if the object point is at one focal point and the HPo><u
image is at the other. But if we depart from this condition we definitely 2&AX_#P
do get spherical aberration. ~i>'3j0@k