Auto otf has never been truly linear (in any camera) , that is at different
light values the actual otf will be +- a certain amount. Compare it to the
equivalent exposure in manual and the difference can be 1/2 stop. Throw in
film reflectance and results can be unpredictable.
John
Camtech
C.H.Ling wrote:
> I also have some problem with my OM4Ti, the auto mode at 1/60s or below
> have 2/3 stop to 1 stop over (OTF mode) depends on the film used. The
> camera was checked by the OM service center in Hong Kong, they said the
> exposure were okay. Then I show him how I observed this problem. He play
> for a while and take another OM4Ti for comparison. The same problem happen
> and he told me this is the first time he found this problem (he has been
> servicing OM camera for more than 20 years), he had no idea on what is
> wrong. So I started to use manual or spot mode when exposure is below
> 1/60s.
>
> All OM4Ti owner here can try the following procedure to see if you have the
> same problem or not.
>
> Load your 4Ti with a piece of film, focus on a blank wall, adjust the
> aperture to let the exposure fall to below 1/60s. Set the memory on, note
> the reading on shutter speed. Fire the camera and check the memorized
> reading again. I think you will see around 1/3 to 1 stop different.
>
> C.H.Ling
>
> ----------
> > From: jocke1s@xxxxxxxxxxxxx
> > To: OMlist <olympus@xxxxxxxxxxxxxxx>
> > Subject: [OM] OM4Ti meter
> > Date: Saturday, June 27, 1998 3:39 PM
> >
> > Hi all,
> >
> > Am I having a meter problem with my OM4Ti?
> > Maybe I just haven't figured it out yet but
> > here is why I am unsure.
> >
> > Camera mounted on tripod.
> >
> > Auto: f4 1/15 I switch to Manual and get 1/30 as the right exposure.
> >
> > Auto spot: 1/8+ 2/3 Manual spot 1/30.
> >
> > I have mostly been taking prints and even then I had
> > some shots that were way of (I normally blame it on
> > myself though). But I had this idea *smile* that
> > the meter should show the same in auto and manual.
> > Am I wrong ?
> > If I am not, what could be wrong ?
> >
> > I will make a 1 roll test with slide film next
> > week if any of you think this metering behaviuor
> > is strange.
> >
> > Please don't let it be anything wrong with my OM.
> > Its so very very nice :)
> >
> > Best regards
> > Joakim Svensson
>
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