Should I be concerned about diffraction at f/16? A friend who's been interested in m4/3 seems to be. But I've shot some following the Sunny 16 rule and I can't really tell. Do I need to be pixel peeping beyond 100% to see a difference? Disclaimer: I'm not a nut landscaper, but he is. My interpretation of the respective rules: 1/ISO speed in bright sun @ f/16 and 1/ISO speed in moonlight @ f/11. Right...?