Another explanation. Often these marks are the infrared focus point.
Check your manual.
tOM
On Friday, September 06, 2002 at 10:24, Harry Wiechel
<olympus@xxxxxxxxxxxxxxx>
wrote re "RE: [OM] Aperture Ring Mark questio" saying:
>
> At 09:23 AM 9/6/2002 +0200, Harry wrote:
> >Hi all Zuiks.
> >
> >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.
>
> // richard
>
> Richard, yes this is what I thought it was, but it is also on lenses
> where there IS enough room for the print.
>
> harry
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