I modified a Vivitar 70-210 zoom to fit my K10D as shown
here. It worked wonderfully; not the best lens, but it worked.
A few days ago, I got a K-r, and the lens made the camera go crazy. It mounted fine, metered fine, but when I pressed the shutter, the mirror actuated twice, no image was recorded, and thereafter every button on the camera caused the mirror to slap. I turned it off, removed the lens and have been wary to try it again. I did pop it back on the K10D and it was still fine there.
Thoughts? Should I try it again? Should I remove the flange piece completely? Should I just forget about the lens?