They are talking about movement of the linkage that connects the meter
body to the aperture and speed rings. It is the whole body of the meter
moving, not the needle moving within the body. I don't know what Oly did
to protect the needle bearings, although they seem to be pretty robust.
Moose
Winsor Crosby wrote:
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
I am surprised that there would be movement. Most better cameras of
the era physically locked down the meter movement when switched off to
avoid shock damage to the delicate jewelled movement. Did the OM1N
meter have some special design that protected it from damage?
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