Thanks... i experimented with the external flash and i found out the triggers and such, now just need to build a switch for it... the switch build for it will be easy, but i want to interface it with my S3IS. I wanna try the USB remote thingy, but can someone show me the complete and working diagram? with the voltages and such?
Hmm... maybe an IR trigger from the cam's USB port to an IR receiver of the external flash's switch?