When the asa knob is set to asa 100 and you want +2 compensation, yopu are
actually setting the asa temporarily to asa 25. That is where the brushes
are being set on the asa ceramic board. So, when you get to the low limit
of asa 12 and try to go for + compensation, the brushes are already at the
maximum exposure position of asa 12, there would have to be a resistive
position inside the camera for asa 6 and 3 for you to get +1 and +2 stops.
Similar explanation goes for high end asa's.
John
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----- Original Message -----
From: <Alex.Hughes@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, August 17, 1999 5:54 AM
Subject: Re: [OM] Display of OM-4/Underexposure at high film speeds?
>
>
> On my recently aquired OM-4 I can still make exposure compensations for 2
full
> stops in both directions at 3200 ASA. However, when moving the
compensation dial
> to overexpose (ie positive) the ASA dial moves with it, so after moving it
two
> full stops the reading in the ASA window is 1600. It then has to be reset
when
> moving the compansation dial back to zero - kind of annoying if I were
using
> that film speed on a regular basis.
>
> I think that this is normal behaviour, but if it is a fault could someone
let me
> know?!
>
> Many thanks
>
> Alex Hughes
>
>
>
> This is true for most if not all Olympi. At maximum asa there is no
> compensation for minus or underexposing. At minimum asa, you cannot
> overexpose.
>
>
> >
> > I have some question concerning the OM-4(t):
> > 1.) Under-/Overexposure dial
> > With my OM2s an OM2n there is no way for setting an underexposure at
> > maximum film speed. How is this with the OM-4?
> > 2.) When using film speeds of 3200 ASA at my OM2s - with aperture
setting
> > at lowest f-stop - the minimum speed shown in the display is about
1/30th
> > second even though in Auto - Mode it uses longer shutter speeds. What
does
> > the OM-4 display show in such situations?.
> >
>
>
>
>
>
>
>
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