Tested but seems the camera flash compensation setting does not work. Say I use M f5.6, 1/60s, normally with Canon I +1 flash and bounce, but D100 does not work. So I changed SB28 to f8 using A mode, and TTL does not work??? Then it seems better. For low ceiling I have no problem, but what I am afraid is high ceiling open space, how noisy is the ISO800? Anyone use it for indoor dark environment?