----- Original Message -----
From: "Alan" <atk@xxxxxxxxxx>
>
> This question is primarily directed at Gary Reese -- but has anyone taken
> into account curvature of field when rating edge sharpness of a lens at
> close focus.
Usually not, but field curvature do automatically come into pay for the
final performance of a lens and it should be. Just like the L*ica 35/1.4,
50/1.4 and 75/1.4 once tested by Pop photo, the high field curvature lead to
the very low SQF score at F1.4 and F2 and their test target was even at
infinity.
Aka, Gary test (probably not relevant since he uses 1:40 but if
> he had used 1:8 it might be) would edge test differently if focus was
optimized
> for the edge and not the center ?
>
For sure it will be different if you focus at the edges when evaluating the
edge performance.
> Alan
>
C.H.Ling
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