I also see a lot of newbies on another site asking why they aren't getting sharp photos of people when they're using f2. There seems to be a lot of lack of understanding of how to use apertures. There are also a large number of people who seem to think you start seeing the effects of diffraction at f8 or so and won't stop down beyond that. It's one thing to use DOF creatively and on purpose, but I've seen a number of shots that just look like accidents.