The Nikon PB-6 is a sturdy late-model bellows that features autodiaphragm capability (with a compatible double release, not included) and a built-in stage focusing system. Accepts any Nikon F-mount lens; the camera end is a standard F mount but practical compatibility will depend on the shape of your camera (some bulkier AF and digital cameras will require an additional extension tube- not included- to clear the back of the rail). In excellent condition.