For what it's worth I've never had a problem with my Peak 1 either. When I bought it (new) years ago I tested it to see if any calibration was needed and found it was dead on. Then again, the plastic Paterson I used for years before that was just as accurate. Maybe I got lucky on that one. I invested in the Peak so I could see further away from the center, but I'm not sure I'd do that now. They're damn expensive and my prints were already as sharp as they could get from a focusing perspective.