I've had some problems lately with my Nikon D40's autofocus. When I shoot in manual, shutter priority, or aperature priority, I often have trouble getting my camera to focus correctly. I have the lens set to A or M/A. Sometimes, even when on autofocus, the camera will take the picture and the subject area is not focused correctly. It's happened in varying situations, so I don't think low contrast is the issue.
I use manual focus sometimes when shooting with my macro, but I'm too old and too slow to capture my three-year-old without autofocus!
Any ideas????? Thanks!