The Nikon D90 can be used as a master/commander flash unit. The D90 is however limited to
2 groups of flashes, compared to 3 groups on the SU-800
Press menu and navigate to the custom setting menu, the one with the pen icon on it, then choose sub-menu e. To confirm selection press ok, or right on the multi selector.
Navigate to custom setting e3. Confirm the selection.
On this screen you have four choices, TTL, M, RPT and Commander mode. Pick commander mode and confirm selection.
In this menu, you set-up the different modes you want for you`r wireless flash needs. Press ok when you are done, and you are ready to use the D90 as a master/commander flash unit.
If you followed the steps above you should now see a C next to the flash icon in custom setting #e2. This tells you that the camera is now in commander mode.
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