may be a dumb question but-
if wiring the shutter off of the pin 13 connection (or off of the 14, 17 pins for an interlock) is there enough juice to power a little led??
what voltage is looped through the pin 13 (or 14, 17 loop) for the shutter? im assuming 5V?? and if so, if wiring the LED, it shouldnt drop enough voltage or current to disrupt the circuit to trip the shutter should it?
-Marc