I have a new (to me) Nikon 24/2.8 AIs that appears broken to me. On a test roll it is only sharp in a circular area in the center of the frame. Gets softer and softer as you get near the edges of the frame. These are frames shot at 5.6, 8, and 11. Has anyone else seen anything like this? Is it something to to do with the CRC? Where would you send it for repair other than Nikon USA? I would post the offending pics but since I was just blowing off a short roll to test a new camera and lens I didn't pay the $2 for a CD. Thanks for donating your experience.