hiya a few months ago i got a canon g3, upgrade from a eos 300. first stab in the digital world. now with non digital cams you had a shutter release input, which you could build your own sensors and whatnot for, for taking high speed pics etc etc. it was pretty much a case of applying the right signal to the input, presumably a specific voltage. never really got round to doing it, because i wasnt into photography much then (you had to pay to see the results of your pics, so creativity was expensive ;)) however now im taking loads of shots, and i'd like to play around with a sensor which i can attach to the camera, and somehow using sound/light be able to trigger the unit. i have no clue how to go about this with my g3. anyone?