Thanks for the responses, I do know how to use most of the lens but I still do not know how to unlock the two rings. I do know that the lens rings lock together but usually they still turn. It also will not trip the shutter. Well thanks again.......James Sent from my iPhone On Feb 24, 2011, at 10:15 PM, James <jmswllms@xxxxxxxxxxxxx> wrote: > I have borrowed a 150mm sonnar lens and a 2x multiplier and I am having > problems. The lens shutter speed and fstop rings will not turn, they are > locked on 4 and B and the lens will not shoot. Also there are three metal > levers, one is marked with V X M next to it, what are these for. The > multiplier is in great shape but I was wondering what are the adjustments for > exposure, how many stops do I adjust for. I hope you guys can help, > thanks............James