Over the last few days, I've experimented with the commander mode of my D90 with my SB600 flash. Commander mode not only allows you to wirelessly trigger your flash but also allows the D90 to control the output. In essence, you could allow the camera to completely determine the flash output. The results I got with iTTL (i.e. where the camera completely controls the output of the flash) were okay but not quite what I had in mind. In the end I set it to manual mode.
I had intended to use my Sigma as a second flash for fill but the preflash that the commander mode uses fires the Sigma before its supposed to. As such, I used the SB600 as the key light and used the on-camera flash for on axis fill.
I have to say I enjoyed the results. They turned out pretty much exactly as I had hoped. Granted I would have liked a more attractive model to work with...
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