Sorry if this is a dumb question but I have a question about using aperture priority mode vs. manual mode - Currently, I shoot most of my photos in aperture priority, and wondered why ppl suggest using manual mode when ap.priority seems to much easier? For example, say I set f/4.5 for a shallow DOF at my subject, the camera automatically determines the correct shutter speed for me to give me the "correct" exposure. If i want to over or under expose I can just adjust that by using the dial, and the camera will spit out a faster or slower shutter speed. Isn't this essentially giving you the flexibility that you can get in manual mode? So then what's the advantage of using manual mode over other modes?