I'm a noobie. Can someone clarify this specific question about AE lock to me? I know that you would use ae lock so that you could expose to one thing and focus on another, so is this only used in Tv and Av, and not in manual mode? Since exposure is controlled by the shutter speed and aperture, can't you just point at what you want to expose at, set the aperture and shutter speed, focus on the subject, recompose, then shoot? It would help out a lot if someone expained a scenario and how they would use ae lock. Thanks in advance.