Auto Bellows can be extended from 38mm to 170mm in the normal position. This unit provides a lens-reversing feature on the front plate and a double cable release is needed for operating the automatic diaphragm. A measuring scale that indicates how far the bellows has been drawn out both with the lens in a normal and reversed position is included. The movable tripod receptacle is mounted on a single rack-and-pinion track. Magnifacation range with a 50mm lens is .8x to 3.0x.