Chuck,
The Om2S and OM4's use a sensitive gate, high voltage thyristor switch,
so can easily withstand the <330V on the flash contacts (typ more like 200V for
m,any flashes) . The Om1/2 uses mechanical switch with test insulation of 500V
according to service manual. The Om2N uses mechanical contact isolated by
1N4004 (400V ) diode. Anecdotally people on this list have reported damaging
OM4 in the rain with high voltage flash. I am skeptical that this actually
happened.unless somehow camera ground came adrift from ccts, since the leakage
path would have to get to one of the ic's which are isolated from the
thyristor gate by a capacitor (from memory). On the other hand water could
easily cause other leakage problems as the insulation requirements for the
photo-sensors etc are extremely high.(probably > 100M Ohms)
Regards,
Tim HGughes
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