So I'm indoors today. Playing w/ my camera in AV mode. I'm trying to do a very simple thing. Well, at least it sounds like it should be simple. I'm trying to create depth of field between a book I have open on my desk, and several behind it. I'd like the first book to be sharp, and clear, and the ones behind it to be a little out of focus. I've used apertures from the lowest (wide open) top the smallest available and still can't seem to get the affect I want. Are the books standing up too close?