I can't work out what's going on. When I shoot with my SB800, it underexposes by just shy of a stop. When I add +1 FEC, all is basically fine, but it's really bugging me. Also, when I set the FEC on flash, I see on camera that FEC has been set, but not by how much. Is it better to set FEC on camera, or on flash? (Or does it make a difference?) Finally, is there a Nikon equivalent to the EOS flash bible that explains how the metering works in the different modes? With EOS flash, in Av, the camera meters for ambient light levels, and the flash is a secondary light source. In M, the flash is the primary light source, and in P, if the shutter speed is 1/60 or faster, the flash is a secondary light source, but if the shutter speed needs to go slower, the flash then becomes the primary light source. TIA!