I just picked up a beautiful Canon FD 50/1.4 SSC lens. It is the older breech-lock style with silver ring at mount end of lens. I have read a bit about how aperture cannot be adjusted unless lens is mounted, as I initially thought the lens was stuck in the wide open position. What I am seeing on camera is no difference when I adjust aperture manually, from 1.4 all the down to 16. I've read some more about these lenses, and see that I should be able to lock the larger lever on lens and then be able to control aperture manually, but that does not work either. Any ideas? I have a Fotodiox adapter, which has the little notch for pin built in, and I've tried it with the lock/open ring on adapter turned both ways - no difference. Lens is still pretty sweet just in wide open position, but I'd obviously like to see what it can do stopped down as well. Any ideas would be greatly appreciated!