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I'm no canon expert, however there are/is a design available for a long exposure setup that uses an opto-coupler rather than the transistor circuit you are looking at. The opto-coupler will isolate your camera from the pc, so from that point it will not let the smoke out of your camera. It stands to reason that as long as your camera uses a 2.5mm stereo socket that the circuit configuration will work.....search for the link to the optocoupler design, if nobody else can point you in the right direction, I'll see if I can find it, but you should be able to google around and find it.
cheers,
Doug
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