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SU-800 on my D3s and the SU-800. Both set on channel 1. But they're still not talking together...
That statement doesn't make sense. It sounds like you're saying that you have two SU-800 units...but you only need one. Did you mean SB-800? I'll just presume that.
The SB-800 should be set to Remote mode...not Master mode. Also, on the SU-800 make sure that the group is enabled. So set Group A to TTL, and then make sure the SB-800 is set to Group A.