#1. "RE: D7000 Flash Setting Question" In response to Reply # 0 Tue 23-Oct-12 05:54 PM by km6xz
St Petersburg, RU
No it is not since it uses visible light for communications between the remove flash units and the camera. I assume that is not your real question, possibly how to prevent the commander from contributing to exposure. The answer to that one is: it already does if set to Commander Only mode in the camera flash setup menu. The commander works but generating a burst of light that is actually a pulse position code to sequentially command the groups to fire a low power flash and then the commander calculated the returned light from each group and then issues another quick burst that sets the power of each group based on the calculation. Then, after all that, the commander sends the command to fire and take the shot. That all happens in a blink of an eye so most people do not notice pre-flashes so do not blink. When the commander is set to Commander only, the trigger pulse is the last one sent so it is over before the shutter is open, so there is no commander contribution to the exposure. You can set the commander to fire in manual or TTL mode when the shutter is open so the commander contributes to the exposure.
Once in awhile you get a subject that has super sensitive reaction to the pre-flash sequence resulting in eyes closed due to blinking. Stan St Petersburg Russia
#4. "RE: D7000 Flash Setting Question" In response to Reply # 3
Thank you the SG-31R looks promising. I suppose there's some light leakage from the sides, but is far less expensive than, say, a wireless setup.
Found this SG-31Rreview on B&H Photo... This review is my setup
Even with the TTL set to -- (off) for the primary flash on my D7000, I was still getting shadows on my green screen making it more difficult to isolate my subjects. I popped on the SG-3IR and voila, no more shadow. The two SB-700s still flash just as they should, but the camera flash is completely blocked and all is glorious... well, some of the male Karate instructors could use a makeover, but the photos are great!