OK, I'm feelilng really idiotic right now. My sb600 does not seem to be talking to my D90, or vice-versa. I've been online, read my manuals, and nothing is working like it should. I probably missed one little (or big) thing that is messing things up. Whatever mode I use (Aperture, Shutter,) and change the settings on purpose, the flash is supposed to compensate for the correct exposure...right? It is not happening. I may as well be shooting all manual and setting the flash to manual, too. Can someone please go step by step through the settings I need to have on my camera and the flash to make it work correctly? Really, I'm pretty smart but this is frustrating me to no end. My main shooting will be at sunset on the beach with people, and indoors in large open rooms. Thanks!