> I would guess it was a bad 2x, I have the Tamron MC7, > which I believe is the same as the Kenko and see no > difference in manual focus operation.
Funny thing is, it happened with 2 different TCs. I guess I should have mentioned that the body was the istD and the lens was the Tamron 28-75mm f/2.8 Di....not sure if this would have made a difference....
