External Sync Mod for Canon Flash
![](http://photos1.blogger.com/blogger/3792/2480/400/37_1.jpg)
This thing works both ways - tied to a receiver to fire the flash, or with the flash on camera and hooked to a transmitter to fire it (to light up a second flash.)
This will, of course, void your warranty. But the electronics of adding an extra jack are very simple, so I would not expect complications form this particular surgery. But be advised.
There's more info here.
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