Yeah my thread title sucks something awful but I didn't know how to describe my question in a few words. I have my D80's AE-L button set to only lock the exposure, and the shutter button I thought would only lock the focus (unless I have it in continuo focus mode of course). Let's say I have the camera in Aperture priority set to f/4. So why can I, say, focus on my foot and get 1/125, keep the shutter button half pressed, swing the camera up and point it at the sun, but the light meter only changes to like 1/500? Then if I let go of the shutter button altogether while it is still pointed at the sun, then it shoots up to 1/2000+ or whatever as would make sense. I thought the point of only locking the focus meant that I could recompose and the exposure would change accordingly. Why does it only change so much?