I have a 20D and I use a blow switch, just buy a regular RS-80N3 remote for your camera BHphotovideocom is a web site were you can find it, than cut it, get the lenght you need than try the wires on the blow switch until they activated your camera, i think the red w/black together on copper end of blow switch and the white on silver. I chose the blow switch because it does not brake as easy as the other switch. Have a good time taking pictures.