Perhaps its time to send your OM to John H for a CLA ?
;-)
>does this mean that when set to manual 1/250th, I'm
>actually
> getting 1/197th, then?
I am not sure. In addition to inaccuracies in
measurement and shutter speed, its a major major
oversimplification to assume that the shutter curtains
move with a constant speed of 36mm/1/60s = 2160 mm/s .
The shutter curtain assemby has mass and its spring
loaded. It accelerates from zero velocity, reaches a
peak somewhere in between, starts to decelerate and
finally collides coming to an abrupt halt.
Perhaps only Maitani san and a few others would know the
exact dynamics involved. Its anything but moving at a
constant speed, so the 9mm (1/4 width) is only a very
rough estimate. Your measurement (11mm) is probably
closer to the truth.
For the mathematically inclined and from general
physics, its a spring loaded mass system and its
motion can be approximately described by a second
order differential d(2)x/dx(2)= Kx/M . K = spring
constant, M = mass of shutter assembly, not counting
the moment of intertia of any moving parts.
-Tim
> > Can you be more specific as to what fraction of the
> > right side of the frame got overexposed ?
>
> Measuring off the negatives, the rightmost 11mm of it's been exposed. Doing
> the math, does this mean that when set to manual 1/250th, I'm actually
> getting 1/197th, then?
>
> -- dan
>
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