An attempt is made to obtain optimum values of weighting factors in automatic correction of lens aberations. Each weighting factor is a product of the following two factors.
1) “Intrinsic weight” τ
i, which is prescribed by the designer, determines the relative efficiency in correcting the
i-th aberration.
2) “Compensating factor” σ
i, which is defined by σ
i=
C (|grad
gi|)
-1, where
C is a normalizing constant and
gi the
i-th aberration. Here, |grad
gi| is regarded as a suitable measure for the difference in effectiveness of aberration correction.
Results of numerical experiments suggest that, in most cases, all the intrinsic, weights can be set equal to unity and the assignment of weighting factors can be made to some extent in an automatic way.
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