I'm trying to get this figured out in my head. Lets say I'm shooting a bride and I want to make sure the dress is white. Normally I would take a reading and open up (or slow down) an extra stop or two. Now if I'm using a flash...I'll have the shutter to the sync speed 1/125...and the aperture set to match my flash setting (either F4 or F8) lets say F4. I like to set the ISO on the flash 1 or 1.5 stops faster so that the flash is not over powering. By doing this do I get less exposure? (the opposite of what I wanted) Could I compensate the exposure by changing the aperture away from the setting on the flash? Is this the same as changing the ISO on the flash? Is compensating the flash the same as compensating the exposure? Am I on crack: :? I've never had any problems but I shoot print film and my lab does a good job so I'm not quite sure if my exposure is "right" or if they are fixing it for me.