NCAndy Offline Upload & Sell: Off
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The 600EX-rt is actually replaced by the 600EX-RT2 but really I doubt there is all that much difference in actual use. To use the 600 flashes wirelessly, you would need either a 600 on the camera as a master or the ST-E3 on the camera acting as a master. That is for radio mode. If you want to use the old optical system, you could use your 580EXII as a master as long as you had good line of sight, etc.
The 1Dx can not be used as as master itself in optical mode, it has no pop up flash, like the 7D or 7D2. You would need to decide how you wanted to trigger the 600s. I use the ST-E3 myself though you could check out the cheaper yongnuo copy.
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