#1. "RE: Sb600 and Commander mode? " In response to Reply # 0
New York City, US
Chuck, When the camera's on-board flash is set in Commander mode, it is essentially turned off because it does not fire at fully intensity and is not the primary light source. The flash will fire a low/lower intensity flash because that is what triggers the remote flash unit.
Hope this helps...JL
________________________________________ 44+ years of Nikon ownership and counting Visit my SmugMug gallery
#3. "RE: Sb600 and Commander mode? " In response to Reply # 0
Nikon CLS wireless flash control uses flashes of light to communicate commands from the Master (Commander) to the remotes so you can't turn the Commander off completely. In the camera menu under flash commander mode, you can set the built-in Speedlight to -- and it will fire at very low power not contributing to the exposure unless you are shooting at macro distances or very close to your subject. You can eliminate that by placing an SG-3IR in the hotshoe to convert the White Light to InfraRed.