Below (approx.) 1/45th, shutter speeds are computed off the film, during
exposure. Auto accuracy will vary from film to film due to differences in
reflectance of the film surface.
_________________________________
John Hermanson www.zuiko.com
Camtech, Olympus Sales & Service since 1977
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631-424-2121 For Free Olympus manuals,
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----- Original Message -----
From: "Marten Beels" <mbeels@xxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, July 08, 2002 11:45 PM
Subject: [OM] shutter curtains and metering
> >The metering system uses two CdS sensors to estimate
> >the shutter speed, but also has two silicon blue
> >sensors that read the light reflected off the
> >first shutter blind, or off the film when long
> >exposures are used. During manual exposure, only the
> >CdS sensors are used.
>
> I've been wondering about this. I understand that the
> first shutter curtain has a black and white checker
> pattern which is used to center weight the meter's
> sensitivity. The OM-2 had two different versions of
> this, one more emphasized then the other. However,
> what happens when the exposure is significantly longer
> then 1/60? The checker pattern will have very little
> effect on the meters. Are longer exposures less
> center weighted because of this?
>
> Curiously,
>
> Marten
>
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