With the meter off, and therefore no current flowing in the circuit, movement
in the meter can only be caused by the coupling arangements. Moving the film
speed dial physically rotates the base of the galvanometer, as does changing
aperture and shutter speed. This implies that the settings which centre the
meter under these conditions is the absolute minumum limit of possible
measurement for the meter (ie no current from the CdS cells).
When the meter is swithched on, the Cds cells become active, and the meter
needle will deflect upwards in proportion to the current. In that case the
reading should match the OM4 (ish). Never tried this myself, so I don't know if
10 stops is the right answer.
Julian
> from: Garth Wood <garth@xxxxxxxxxxxxxxx>
> date: Mon, 07 Oct 2002 16:28:19
> to: olympus@xxxxxxxxxxxxxxx
> subject: Re: [OM] Strange meter in my OM-1n
>
> At 11:06 AM 07/10/2002 -0400, Tom Scales wrote:
> >Yep, that's the way it works. Someone else will have a explanation, as I
> >don't, but I know that it does that and it is normal.
>
> Setting should be maximum aperture (with whatever lens you've got mounted),
> ISO 100, "B" shutter speed. Meter should read dead-centre. I'm probably
> wrong in this, but I was always under the impression that this served two
> purposes:
>
> 1. It was a quick check that the meter was working and properly calibrated;
> and
> 2. It was a quick check that the battery was reasonably charged up.
>
> I think I'm closer to the mark with "2" rather than "1" above. (I'm sure
> there are people who know better -- I couldn't find it in the FAQ, but
> didn't look in the e-SIF.)
>
> Garth
>
>
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