So last night I couldn't sleep. It was about 2am, I was sat watching TV with my camera and a few other items sitting on a table nearby. I'd just bought a new diffuser and thought I'd give the Terminator look a try.
Thanks for the welcome. A little shooting info for those interested.
Nikon D200
Nikon 50mm f/1.8D
1/250th of a second @ f/22, ISO100.
SB600 was mounted off to the side on a tripod pointing at my face on 1/2 power through a 90x120cm diffuser (triggered from the built-in flash @ 1/128th power so it didn't light up anything in the image) with a couple of pieces of A2 foamcore blocking the side of the SB600 so it didn't light up the curtains behind me.
I had one of my tripods sitting in front of the camera with the lights on so I could get my height and focus right, then turned out the lights, replaced the tripod with myself, and fired the camera with my MC-20 remote.
If you've got your shutter speed faster enough, your aperture setting high enough (bigger number, smaller apeture), your ISO low enough it shouldn't illuminate anything in the set (unless you're shooting macro, then it may).
One trick I do sometimes, I have a couple of SB-50DX flashes still left over from when I was shooting a D100. The SB-50DX came with an IR cover (Part# SW-9IR) that goes over the flash head so that you can optically trigger remote flashes without any light from the SB-50DX actually hitting your scene.
Obviously the SB-50DX isn't iTTL so it can't be used as a commander, but I'll occasionally use masking tape (make sure it's good quality stuff that doesn't leave a residue) to hold the IR cover in place over the D200's built in flash to trigger the others without it being seen in the shot.
