On Fri, 14 Jun 2002 11:36:08 +0100, john@xxxxxxxxxxxxxxxx wrote:
>That surprises me. First the shutter has to stay open for 1/60
>second, yet the flash must receive its quench pulse in something less
>than 1/1000 second (assuming full power is 1/1000 second). Doesn't
>seem to add up!
>
Actually, I jumped to a conclusion and it could! I see the diagram
now (with the 10K resistor connected to the collector of the pnp
transistor Q102. The flash is triggered as soon as the first curtain
is fully open and the magnet volts are cut off within less than 1/1000
second after that has happened. You should therefore see 3V at the
quench contact (with no flash connected) all thr time the shutter
second curtain is held by the magnet on an OM2. The 2n may be
(probably is) different.
John Gruffydd (Mold, Wales, UK)
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