I do know that manufacturers are 'allowed' to be off by 10 0n their claims
for both f stop and zoom range. I notice that they always seem to be off in
the optimistic direction. You can see this by reading the fine print in
published lens tests. I never gave it much thought if this was allowed as a
'normal' difference in manufacturing, or what. I can't see it as that; could
you imagine a lens that was 'allowed' to be100ff in focusing?!
George S.
zuiko@xxxxxxx writes:
> Okay, somebody who knows better speak up and correct my misinformation...but
> I thought the f-stop reading on zooms were either an "average" or at one
> specific point on their zoom range -- due to the variable geometry of their
> lens groups. (yes? no?)
>
>
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