Nikon SB-900 Flash Master/Commander Settings
http://www.steeletraining.com - How to set the Nikon SB-900 in Master mode for multi-flash TTL setups with remote slave flashes. Also how to make the flash act as a Commander without acting as a light source.
This video is an excerpt from "How to Shoot Professional-Looking Headshots and Portraits on a Budget with Small Flashes" at SteeleTraining.com.