Same issue as Lappers. I've already sent it back once for (recalibration). Came back with exact same issues. I have a D40x which I've I loved and did some amazing stuff with, but I can't for the life of me shoot good pictures with this thing. Always back-focussed. It may have something to do with my lens (same nikkor 18-200) but will test more on other lenses. I have a nikkor 55mm too but haven't had much luck there either. Will try the ruler test to see what I get.