Using 2 remote flashes and 2 cameras, I successfully synched several gadgets to pull this one off. This method is hit or miss, as the flash always is for 3D photography with the Canon SD1000s. Without remote flashes, I use both camera flashes when flash is necessary. I found the trick to getting the remotes to synch correctly is to turn off one of the camera flashes and set the shutters manually using SDM. I still can't stop the Canon auto-flash feature. It does set off the remote flashes, so I wait for them to recharge before hitting the shutter button the 2nd time.
