Second hand BPM mount converter Bellows Interchangeable Mount for sale. Used Rare mount converter has screw clamps to attach a male and female pair of BPM bellows adaptors/mounts so a lens of one fitting can be attched to a camera of another. You may want to use a Contax Lens on an Olympus body or a Pentax lens on a Canon body. Any camera/lens combination can be used providing there's a BPM adaptor made. Very hard to find item. Infinity is lost because the adaptor mounts create around 25mm or so extension.
As new The photograph above is the actual BPM mount converter I am selling.