Just recently started having issues with my Tokina 28-70/2.8 AT-X on the D100. When I power it up, for use, I usually get a flashing F-- on the LCD. How I get past this is to release the lens a mm or 2 and then lock it back in, with the power up on the body. Other than this initial start-up problem, I have no other issues with this lens once past this point. I don't have this problem with any of my Nikkor lenses. I've taken an eraser to the contacts on the lens, and the body, with no positive results. Anybody seen this issue? Other than sending this non-warranty lens in for repair, or dealing with it at each power-up is there anything else I can try?