Mamiya's 6x7 studio SLR — leaf-shutter lenses, rotating back, bellows focus, 1970.
The Mamiya RB67 Professional is a 1970 medium-format SLR that launched Mamiya's 6x7 studio system. It was designed as a modular, bellows-focusing camera for studios, with a rotating film back that lets the 6x7 frame switch between portrait and landscape orientation without turning the whole camera.
It is a medium-format (6x7) SLR producing a 56x67mm frame on 120 or 220 film through interchangeable rotating film backs. It uses leaf shutters built into each lens rather than a focal-plane shutter in the body, so flash synchronises at all speeds. The body focuses by a bellows and rack-and-pinion mechanism, takes interchangeable waist-level or prism finders and focusing screens, and mounts Mamiya RB67 bayonet lenses. It is fully mechanical with no built-in meter.
The large 6x7 frame and rotating back made the RB67 a mainstay of portrait and product studios, where its bellows allows close focusing and the rotating magazine speeds up switching orientation. It is heavy and tripod-bound by design, built for deliberate, controlled work rather than handheld shooting.
Test each lens leaf shutter for accurate speeds, since these are the timing mechanism, and check the bellows for light leaks or cracks. Inspect film-back seals and the dark slide, the rotating-back mechanism and its seals, the mirror and screen, and the waist-level finder mirror. Confirm the multiple-exposure and revolving interlocks work, and check foam seals for perishing.