It's for zooms whose aperture changes, reducing at longer focal lengths.
The mark indicates the smaller f/stop at the longest focal length.
tOM
On Friday, September 06, 2002 at 1:34, dreammoose <olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] Aperture Ring Mark questio" saying:
> That's what it looks like to me. It's not on all lenses, for example the
> 75-150/4 doesn't have it and the '4' lines up with the index mark wide open.
>
> Moose
>
> Richard F. Man wrote:
>
> > At 09:23 AM 9/6/2002 +0200, Harry wrote:
> >
> >> here is a question that has bothered me for some time, (though really
> >> nothing important). Over the years I have accummulated a number of prime
> >> Zuikos and two zooms. All lenses have this little white mark on the
> >> aperture ring at the highes aperture setting (i.e. 2,8) ? Does any one
> >> know what it is supposed to indicate? couldnot find anything in the
> >> archive
> >> on this..
> >
> > Assuming you don't mean a usage mark :-) but the little white line, I
> > think it's to indicate the clickstop for the largest aperture. My
> > guess is the stop between it and the next largest is very small so if
> > they print the aperture number right on the click, it would bunch up
> > to the next largest number.
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