Re: Potential shutter speed problems

[P3D Marcus Warrington <marcus@xxxxxxxxx>]

Mmm.. me and a friend at work have been toying around with a schematic for a 
device for timimg shutter speeds AND also comparing the synchronisation of 
the two shutters. Most timers I've seen just give a reading for a single 
shutter, but in stereophotography we need not only two shutters with the same 
speed but also two shutters that open/close at the same instant. 

The device would basically be built around two light sensors (one for each 
shutter), a clock chip, a counter and a few logic gates. The sensors would be 
placed behind the shutter and the camera fired at a light source. The logic 
gates would enable the counting of the clock signal as soon as the light sensor 
switch tripped, and stop the count when the sensor turned off. The device 
would then have three counters one for each shutter and one for the 
differential.

If we ever get around to actually building something that works I'll post the
schematic.

...or better still if someone with more electronics knowledge (i.e.
some :)) already has one, maybe they could post it..

Marcus

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