Canon Speedlite Transmitters

Jul 21, 2010
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Actually, I believe you need the ST-E2 optical trigger as the ST-E3-RT does not have an optical trigger according to Canon. You can use the 600 RT in optical mode.
Thanks for the correction. Somehow I missed the 580EX in there, which cannot be radio triggered.

For the OP, another option is to use one of the flashes on-camera and the other off-camera, since both can be masters. Another alternative would be the little Speedlite 90EX. Not a powerful flash on it's own, but it can serve as an optical master on-camera.
 
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