Here an FD series camera is attached, with an
FD 50mm f/1.4 lens in place. This would be for
general macro work. The two standards can be
moved and locked in position as needed. A
third knob and lock in the block at the
bottom allows the whole camera/bellows unit
to be cranked back and forth on a tripod
or other mount for focus without disturbing
the bellows settings. The flat scale on
the top shows distance and magnification
and is easily removed if need be.