I wanted to try flash photography so I just received my 430EX II yesterday. I'm slowing getting the hang of it and have taken some good looking photos just playing with it and bouncing flash off walls and ceilings. My question is what is the difference between setting the flash exposure compensation and setting the flash output power. Are they completely independent of each other. I think I can recall from last night playing with it, that when the flash is in manual and power is adjusted, adjusting the FEC did nothing.