>The mechanical shutter can be very accurate like the Nikon FE2, all
>shutter has two things (or more?) to control the shutter speed, the
>first one is the shutter traveling speed, like the OM it is 11ms and
>Nikon FE2 is 3.3ms, it is mechanically controlled. The second one is
>the slit width, it is electronically controlled for electrical
>shutter. The most critical one (or the one that will affected by
>aging) is the traveling speed, it is spring controlled.
>
>C.H.Ling
I've been wondering about this. I'm trying to make a shutter tester,
and am trying to figure out what the correct curtain speed is. 11ms
is of course a time, not a speed, so the question is over what distance
does the curtain travel in 11ms? Is it just the distance from one edge
of the mask to the other, i.e. 36mm? That's what I thought, but in the
repair manual for the om-1, which is the only place I've seen this, is
a timing diagram that shows the travel time for the curtains to be 13.5ms
from edge to edge of the mask. Ok, so maybe the distance is some standard
distance between sensors on commercial shutter testers, and if so, what is
it? From the numbers above, a good guess would be 30mm. Does anyone know
if this is correct?
Thanks,
Mark Marr-Lyon
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