Mamiya's final 6x7 studio SLR — wider mount, leaf-shutter lenses, rotating back, 1990.
The Mamiya RB67 Pro-SD is a 1990 medium-format SLR, the last major body of Mamiya's 6x7 studio system. It widened the lens mount to allow larger apertures and additional lenses and improved compatibility with motorised and specialised film backs, marking the final refinement of the long-running RB line.
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 for flash sync at all speeds and focuses by a bellows and rack-and-pinion mechanism. The body takes interchangeable waist-level or prism finders and focusing screens and mounts Mamiya RB67 lenses, with a wider throat than earlier bodies. It is mechanical with no built-in meter.
As the final RB67 body, the Pro-SD suited studios wanting the widest lens and back compatibility in the system, keeping the large 6x7 frame and rotating magazine for portrait and product work. It remains a heavy, tripod-oriented camera built for deliberate shooting.
Test each lens leaf shutter for accurate speeds and check the bellows for leaks. Confirm the wider mount accepts the intended lenses and adapters, and inspect the rotating back, its seals, and the dark slide. Check the mirror, screen, and finder mirror, and verify foam seals in body and back have not perished.