Try a ND filter, about 1.0.  That will force the aperture to a larger
setting at the specified shutter duration.

Don

-- 
Experience is what lets you recognize
a mistake when you make it again.


"Gordon Moat" <moat@attglobal.net> wrote in message
news:3F2CA976.14BB625E@attglobal.net...
> Eyron wrote:
>
> > The camera is in manual mode and is a Fuji S2 Pro.
> > If I have a set shutter speed (ie sync at 1/125 sec) and the correct
> > aperature reads say  F9 .
> > I need the shutter speed to be 1/125 sec.
> > But I need a lower F stop to limit depth of field.
> > Will minus 3 stops of exposure control alow this and give me a 3 stop
larger
> > aperature?
>
> Wrong way to do this, since your exposure will be way off.
>
> >
> > Also what would my F stop be here?
> > Are there any drawback to use exposure compensation. ( ie noise etc.).
>
> Improper exposure. You would be better off setting the ISO speed three
stops
> different to force a larger aperture (smaller number). Your other option,
if
> you cannot alter the ISO setting that far, would be to place a three stop
ND
> filter over the front of the lens. The ND filter can get you exactly where
you
> want to be, without changing the ISO setting. Those with film cameras
reading
> this post can also do the same thing, and is one of the best reasons to
own an
> ND filter.
>
> Ciao!
>
> Gordon Moat
> Alliance Graphique Studio
> <http://www.allgstudio.com>
>