got a basic nikon slr and no matter what lens i use, when i stop it down to f22 so i can get everything in focus, i never get everything in focus only the closest subject - even when i use manual focus i still get the same problem. wouldn't normally bother me as usually i use a wide aperture, but if i want to do landscapes its a pain! what am i doing wrong? (and yes i use a tripod when i stop down to a small aperture)