Mamiya 120 6x7cm Pro S film back for RB67 zinc This Olympus Auto Bellows is

This Olympus Auto Bellows is a versatile 5-piece rail system that you can use in at least three ways: As a macro bellows

8 STM is a 35-ish-mm equivalent prime lens for EF-S cameras

manual-diaphragm M42 lens- not even a preset system on this one

The upper pan control moves a full 360 degrees smoothly and the bottom has pre-determined stops that are adjustable with the knob inserted into the side

Unsure what makes this "Tri": There's a top compartment (measuring approximately 14x14x24cm) and a bottom compartment (about 15x22x26cm) but I'd assume a third compartment to complete the count

Mamiya 120 6x7cm Pro S film back for RB67 zinc This Olympus Auto Bellows isThis is a 6x7cm format 120 film back for the Mamiya RB67 series of cameras. This Pro S version is compatible with all RB67 models. In very good cosmetic condition, with light surface wear. Film tested, working well.