I have a Nikon N5005 which stops the lens down to f/22 no matter what I do. I tried the lens, a 50mm f/1.8 AF Nikkor, on my F100 and N80 bodies and the lens is perfect. The aperture actuating lever on the N5005 seems OK. It moves down and up when the shutter is activated. I've tried operating the camera/lens combination on all modes, both with and without film loaded. The lens always stops all the way down. Am I doing something wrong?