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Re: [OM] differences in f stops

Subject: Re: [OM] differences in f stops
From: "C.H.Ling" <chling@xxxxxxxxxxxx>
Date: Mon, 01 Apr 2002 14:53:31 +0800
Malcolm Clay wrote:
> 
> > -----Follow-up Message-----
> > From: owner-olympus@xxxxxxxxxxxxxxx
> > Subject: Re: [OM] differences in f stops
> 
> > I also have a Tokina 28-70, it over exposed by around 3/4 stop in
>          <snip> ...
> > lens. All my other Zuikos does not have such problem (except the 28-48
> > which also exhibits a bit strange).
> 
> 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?)

There are two marks on the f-stop scale, one for 28mm and the other
for 70mm (f3.5 and f4.5 respectively wide open), very clear, no
confusion here. But the actual coupling was inaccurate based on the
last slide I exposed, this problem was not found with over 20
different Zuikos I have used.

C.H.Ling

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