Fred Amico Offline Upload & Sell: Off
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Although the Sigma user manual is convoluted at best, you can set the Sigma in slave mode, and then it will trigger from the flash from any other flash unit, including the SB-900.
I guess I should add that, at least with my Sigma EF-500 Super, you don't have to mount it on the camera first to set it in slave mode. That can be done right from the flash unit itself.
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