Thanks Gary for the explanation. As reality is, numbers though usefull can
create an illusion of objectivity.
> << What again does SQF stand for? >>
>
> Subjective Quality Factor. A methodology developed by Popular
> Photography (USA-based photography magazine) which assigns grades based
> on how good a print looks at various levels of magnification. I
> simplified the procedure to 1) evaluate a projected image (after
> sharpening the focus for the area I was evaluating) and 2) look only at
> images projected to an approximately 18x magnification.
>
> In next months issue there will be a major overhaul to SQF testing, with
> tests printed for the recent lenses that have only been presented as
> resolution data. I can't recall that Popular Photography ever told us
> what film they were using for the resolution testing. It makes a pretty
> big difference!
>
> Gary Reese
> Las Vegas, NV
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