Hmmm, on the X and Hs there is no built in commander. Instead SB-800 acts as a commander or master and signals on one of four channels. These channels have an A,B,C and D flash permitting up to four flash units to be 'commanded' by one SB-800. Settings can be different for all units on the selected channel i.e master unit at 1/2, B at 1/16 and C at 1/8 etc.
There are four separate channels to avoid interference between several flash photographers all using the wireless IR signalling system from SB/SU-800's
To be clear the X and Hs just take the pic therefore SB/SU-800 handle the lighting in both i-TTL and manual modes.
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