Chris Hockley wrote:.
I have a good friend that does this with his Nikon. Is this systemdifferent?.
Yes. Nikon has a wireless flash system ("CLS" or "Creative Lighting System"). A lot of the Nikon bodies (D70 and up) can act as wireless flash controllers, as can the SB-800 flash and the SU-800 flash controller..
Canon has a hot-shoe mounted controller similar to the SU-800. Like the Nikon hot-shoe controller, it's a bit pricey..
You can also get "dumb" slave flashes that trigger off the light of a main flash but these lack the intelligence of Nikon's iTTL or Canon's eTTL...
The Canon flash controller is a "Speedlite Transmitter ST-E2"..
A Google search turned up a site on wireless Canon flash that might be worth a quick read. I can't vouch for it's accuracy, but it looked informative ....
Re>I am trying desperately to figure out how I can trigger this flash remotely using the built in flash on the camera.<.
You can't. Might as well stop trying..
Highjack- can the nikon D40 remote flash with the sb800 with out the shoe attachment?..
According to Ken Rockwell's D40 review, the D40's built-in flash "cannot function as a remote commander"..
He says that for that, you'd need a camera-mounted SU-800 ... but I believe that a camera-mounted SB-800 flash would also do. (Likewise, I think I read that the more expensive Canon flash, when mounted on top of a camera, can remote-control other Canon flashes.)..