Mamiya
Mamiya — history
Mamiya began in Tokyo in 1940 as Mamiya Koki Seisakusho, combining the inventive work of Seiichi Mamiya with financing from Tsunejiro Sugawara. Its first camera, the folding Mamiya Six, was a coupled-rangefinder design for 120 film. Instead of moving the lens to focus, a mechanism moved the film plane inside the body. That back-focusing solution let Mamiya keep the lens and folding front relatively simple while placing the focusing control conveniently on the camera. Sources disagree on whether the workshop was established in March or May, so the year is safer than an exact anniversary date.
The firm continued making the Mamiya Six under wartime restrictions and returned to civilian and occupation-market production after 1945. Lens and shutter supply was unstable, and early postwar bodies can appear with different combinations from Olympus, Tokyo Kogaku, Mamiya's own operation, and several shutter makers. In March 1946 Mamiya built a Setagaya factory to make shutters and lenses for itself. It incorporated that operation as Setagaya Koki in 1950, the same year the original workshop became Mamiya Koki Co., Ltd. This sequence is better supported than the often repeated claim that Mamiya simply bought an existing lens maker in 1947.
Sekor became the lens name most closely associated with Mamiya, but it does not identify one optical formula or mount. The name is widely connected to Setagaya Koki, although the familiar expansion of its syllables has not been found in a primary company document. Setagaya Koki was absorbed into Mamiya in 1963; its Tokyo operation closed the following year and was integrated into the newer Urawa factory. A Saku production subsidiary followed in 1970. Manuals and patent records show that Mamiya retained optical design, engineering, and manufacturing capability, while particular products could still use outside shutters, supplied lenses, or later collaborative optical designs.
The interchangeable-lens twin-lens reflex line shows Mamiya's system thinking at its clearest. The Mamiyaflex C Professional appeared in 1957 with paired viewing and taking lenses mounted on removable boards. Bellows focusing made close work possible without a helical in every lens. The family developed through C2, C3, C22, C33, C220, C330, and later revisions until 1994. Most lens boards fit most bodies, but compatibility is not absolute: early shutter housings can interfere with the automatic cocking mechanisms of C33 and later bodies, and some lenses require manual cocking. Chrome, black, and blue-dot appearance are therefore identification clues, not complete generation definitions.
Mamiya did not settle on medium format alone during its first decades. It produced 16mm subminiature cameras, fixed-lens and interchangeable-lens 35mm cameras, and the modular Mamiya Press family. Its 35mm SLRs moved from the widespread M42 screw mount to several proprietary bayonets, including NC and Z families. Period Sekor guides show how an open M42 interface allowed many outside lenses even when Mamiya sold a complete branded range. The Press system likewise requires attention to backs, adapters, and specific lens mounts; a Mamiya Universal and a Polaroid 600SE can look related without accepting every component interchangeably.
The RB67 Professional of 1970 turned Mamiya's modular approach into a studio system. RB referred to the revolving back: the photographer could rotate the film magazine between horizontal and vertical 6×7 framing without moving a tripod-mounted camera. The body used bellows focusing, interchangeable finders and backs, and lenses with leaf shutters for flash synchronization across the shutter range. The Pro-S added interlocks and the 1990 Pro SD enlarged the throat for later lenses and accessories. Older backs and lenses often remain usable, but safety interlocks, adapter rings, and model-specific functions prevent a simple claim of universal compatibility.
The M645 of 1975 pursued a different goal: a smaller 6×4.5 SLR with a focal-plane shutter and more frames per roll. Its manual-focus C and N lens generations belong to the 645 system, not to C-series TLR or RB lenses that also carry a C. The electronically controlled RZ67 followed in 1982, building on the RB body concept while moving shutter control and system communication into the camera. RZ bodies can operate RB lenses in a dedicated mode, but require the lens shutter setting, additional bellows extension, and sometimes an interchange ring. RZ lenses do not become RB lenses merely because the bayonets are related.
Mamiya's broad product program met a severe corporate break in 1984. Osawa, its major international distributor and shareholder, filed for rehabilitation on 29 February, and Mamiya Koki filed on 5 March. Japanese government records treated both as major failures with consequences for workers, lenders, suppliers, and regional businesses. The event is often shortened to a story in which Osawa alone caused Mamiya to abandon 35mm cameras. The safer account is that the two companies' financial crisis forced Mamiya's own reorganization. The 35mm line did not return, while the stronger professional medium-format systems continued.
The rebuilt company introduced the New Mamiya 6 in 1989, reusing the historic name for a new electronic 6×6 rangefinder with interchangeable leaf-shutter lenses and a collapsible lens mount. The 6×7 Mamiya 7 followed in 1995. These compact rangefinders were not mount continuations of the folding 1940 camera. Corporate structure changed again: Olympic absorbed Mamiya Koki in 1992, the combined business took the Mamiya-OP name in 1993, and camera and lens subsidiaries were consolidated at Saku in 1994. Product lineage continued through factories and staff even as the legal parent changed.
Mamiya brought its 645 system into autofocus and digital-back use, culminating in 645AF and AFD bodies and the large-sensor Mamiya ZD released in 2005. Manual-focus 645 lenses retained partial usefulness on later autofocus bodies, but metering and exposure-mode limitations apply. In 2006 Mamiya-OP transferred the optical business, including staff, plant, trademarks, patents, and inventory, to a newly formed digital-imaging company. Mamiya-OP then withdrew from optics and continued in other industries.
Phase One invested in Mamiya Digital Imaging in 2009 and took strategic leadership in development, marketing, and distribution. That year Mamiya, Phase One, and Schneider Kreuznach described a joint lens program: Schneider contributed optical design, Mamiya manufacturing expertise, and Phase One the digital platform. Mamiya Digital Imaging and Leaf Imaging then created the Mamiya Leaf brand in 2012. Phase One acquired Mamiya Digital Imaging's assets in 2015 and organized the Japanese operation as Phase One Japan. Current Phase One systems use Phase One and Schneider Kreuznach branding, while Saku remains part of the organization and support material preserves selected Mamiya compatibility.
Dating Mamiya equipment depends more on a production code than on a global serial sequence. From about 1961, many bodies, lenses, backs, and accessories carry a small gold sticker with two letters: the first represents the year and the second the month. Later models can place the letters before the serial instead. The year alphabet restarts, using A through J for 1961-1970, A through J again for 1971-1980, A through T for 1981-2000, and A through N for 2001-2014. Month letters run A through L. A code such as IE can therefore mean May 1969, 1979, 1989, or 2009 until the model and generation select the correct cycle.
Identification should begin with the complete physical object. Record the exact Mamiya, Mamiya/Sekor, Sekor, Mamiya-OP, Mamiya Leaf, Phase One, or Schneider engraving; camera system; mount; format; shutter location; aperture mechanism; barrel or lens-board generation; serial; product prefix; and separate two-letter date code. Photograph gold stickers before they detach, and do not confuse them with JCII inspection labels. Check the decoded year against a documented model range and preserve ambiguity when two cycles remain possible. This object-first method prevents a TLR lens, M42 Sekor, RB lens, RZ lens, manual 645 lens, and digital 645 lens from being collapsed into one false Mamiya chronology.