The Canon Auto Bellows allows us to reach extreme magnification from approximately 4x the size on the negative to 25x depending on the lens used.
All the photos of extreme magnification - flowers, insects and animals - that we see, have been produced with the use of professional systems like this one. It is in perfect condition both cosmetically and functionally.
It is to be used with the Canon Auto Bellows and it allows the automatic diaphragm of a lens to be closed just before the shutter is released. The shorter of the 2 cables is attached to the camera. The longer cable is attached to the lens mount on the Auto Bellows. The length of the needle in the longer cable must be adjusted so that the shutter is tripped just after the diaphragm is fully closed. This adjustment only needs to be done once, and has to be done when there is no film in the camera. The double cable release provides automatic diaphragm operation with all lenses.