I bought a Micro Nikkor 55/3.5 AI. It arrived last week, and I started using it a couple of days ago. I notice that the highest number on the focusing ring is 15. Even at f/5.6, I can get somewhat close (hyperfocally) to the "15." Thus, it would appear that there is what I would consider enormous depth-of-field in this lens, particularly for a 55mm lens. Is this correct, or is there something I am missing? My Canon FD BL 55/1.2, as good as it is, does not get anywhere near this type of DOF.