Wasn't aware that the Flex system is capable of supporting 5 flash groups which is the big upgrade item for me. Built in RT is a very worthwhile feature for moving forward, just want an RT unit that will allow using existing flash units in 5 channel system as it should cost less than replacing all my flash units. Would seem i have more digging to do.


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I'll see how nicely it plays with the PocketWizard FlexTT5, although my main use for the 600EX, at least initially, will probably be on-camera or via OC-E3 on a flash bracket.
