Mamiya and Zenza Bronica

Seiichi Mamiya and Tsunejiro Sugawara established Mamiya Koki Seisakusho in Tokyo in 1940 and began producing the Mamiya Six. The folding 120-film rangefinder used Mamiya's back-focusing mechanism, moving the film plane for focus while the lens remained fixed. The Japanese Camera Museum reports that the camera remained in production during wartime restrictions.

Corporate history · Mamiya Camera Exhibition: The History of Invention and Ingenuity · About Mamiya

Mamiya rebuilt postwar production and in March 1946 established a Setagaya factory to make shutters and lenses in-house. Early postwar Mamiya Six cameras nevertheless appear with several lens and shutter combinations because supplies were unstable. The factory became Setagaya Koki Co., Ltd. in July 1950, and Mamiya Koki Seisakusho was reorganized as Mamiya Koki Co., Ltd. that December.

Corporate history · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya 6 Model V (1953)

The company expanded into twin-lens reflex, 16mm subminiature, and 35mm cameras while continuing the Mamiya Six line. Its 1957 Mamiyaflex C Professional made the entire paired-lens and shutter board interchangeable and used bellows focusing for close work. The Mamiya Magazine 35, also dated 1957 by the Japanese Camera Museum, carried a Sekor 50mm f/2.8 and used an interchangeable film chamber.

Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya TLR System Summary · Mamiya Sekor Guide

Mamiya introduced the Press camera in 1960 and developed a broad system of roll-film backs, sheet and instant-film accessories, and lenses. The C-series TLR evolved through C2, C3, C22, C33, C220, and C330 branches. Mamiya also sold 35mm SLRs using the Praktica/Pentax M42 screw mount and later proprietary mounts. A new Urawa factory opened in 1963; Setagaya Koki was absorbed that June, and its Tokyo factory operation was integrated into Urawa in 1964.

Corporate history · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya TLR System Summary · Mamiya Sekor Guide

Mamiya established a production subsidiary at Saku in 1970 and released the RB67 Professional that year. Its rotating film magazine changed between horizontal and vertical 6×7 framing without turning the camera, while body bellows handled focusing and lenses supplied leaf shutters. In 1975 the M645 opened a smaller 6×4.5 SLR system using a focal-plane shutter; the M645 1000S followed in 1976 with a 1/1000-second top speed.

Corporate history · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya RB67 Pro-S instruction manual

Mamiya continued professional medium-format development while changing its 35mm strategy through NC, ZE, and Z-series proprietary mounts. The RZ67 Professional arrived in 1982 as an electronically integrated development of the RB concept. Contemporary patent records assigned to Mamiya document active optical calculation, including zoom-lens work, rather than a catalog built entirely from external designs.

Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya RZ67 Pro II instruction manual · JPS58100115A — Zoom lens · Mamiya Sekor Guide

Osawa & Co., Mamiya's important international distributor and shareholder, sought court-supervised rehabilitation in February 1984; Mamiya Koki filed on 5 March. Government records treated both as major failures with effects on suppliers and employment. Mamiya's 35mm camera line ended during the reorganization, while its professional medium-format systems continued.

Cabinet response concerning the failures of Osawa & Co. and Mamiya Koki · Mamiya Z-Series 35mm Cameras

The New Mamiya 6 appeared in 1989 as an electronically controlled 6×6 interchangeable-lens rangefinder with a collapsible lens mount. The RB67 Pro SD followed in 1990. In 1992 Olympic Co., Ltd. absorbed Mamiya Koki; the combined company became Mamiya-OP in 1993. Camera and lens manufacturing subsidiaries Mamiya and Shibata Mamiya were combined at Saku in 1994.

Corporate history · Mamiya Camera Exhibition: The History of Invention and Ingenuity

Mamiya extended the rangefinder concept to the 6×7 Mamiya 7 in 1995 and developed the 645AF platform for film and digital backs. The Mamiya ZD, shown in 2004 and released in 2005, used a large 36×48mm CCD and Mamiya 645AF lenses. Patent records from the period continue to show optical-design work assigned to Mamiya-OP.

Mamiya Camera Exhibition: The History of Invention and Ingenuity · JP2004102100A — Retrofocus type super wide-angle lens

Mamiya-OP transferred its optical-equipment business, including staff, facilities, inventory, trademarks, and patents, to the newly formed Cosmo Digital Imaging business in September 2006. The camera operation soon used the Mamiya Digital Imaging name. Mamiya-OP's own corporate chronology states that it withdrew from optical business, so the continuing camera brand and the continuing Mamiya-OP corporation must not be treated as the same enterprise after this transfer.

Corporate history · Mamiya to sell camera division

Phase One made a major investment in Mamiya Digital Imaging in 2009 and took strategic leadership in research, development, marketing, and distribution. Mamiya, Phase One, and Schneider Kreuznach then announced shared design, development, manufacturing, and delivery of leaf-shutter lenses for the 645DF platform. In 2012 Mamiya Digital Imaging and Leaf Imaging consolidated product development, marketing, and support under the Mamiya Leaf brand while retaining Mamiya labels on cameras and lenses.

Phase One Invests in Mamiya Digital Imaging · Mamiya and Leaf brands and lineups consolidate · Schneider Kreuznach, Phase One, Mamiya Digital Imaging Cooperate to Drive Innovations in Medium Format Digital Lenses

Phase One acquired Mamiya Digital Imaging's assets in December 2015 and established Phase One Japan, taking control of medium-format camera, central-shutter, and lens design and development. The Phase One XF had already launched that June as a new Phase One-designed platform. Current Phase One material lists Saku as a regional office and maintains support or compatibility information for selected Mamiya equipment, but the current product system is Phase One-branded and centers on Schneider Kreuznach lenses. Axcel has held a majority investment in Phase One since 2019.

Phase One Unveils the Future of High-End Photography · Phase One Japan established and succeeds Mamiya optical business · About Phase One · Which products can I get help with from Phase One and Mamiya-Leaf Technical Support · Phase One · Leaf Shutter Lenses

Zenzaburo Yoshino opened the Shinkodo camera shop in Kanda, Tokyo, in 1946 and established Shinkodo Works in Itabashi the following year. The workshop made cigarette cases, powder compacts, and other precision metal goods. That profitable craft business supplied money, tools, and skilled hands for Yoshino's larger ambition: a camera of his own.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Mr. Zenza's Rolls-Royce

Yoshino began sustained camera development in 1952, hiring mechanically skilled staff and investing his own resources. A first prototype was completed in 1956, the year Bronica Camera Co., Ltd. was organized. The long development produced a modular 6x6 reflex whose film handling, mirror motion, removable back, and shutter were designed as an integrated system.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Museum Lecture: The Inside Story of Zenza Bronica Development · Mr. Zenza's Rolls-Royce

The first production Zenza Bronica, later distinguished as the D, reached the market in December 1959. Its 6x6 body combined a 1/1250-second focal-plane shutter, interchangeable film back and finder, automatic film loading, and a descending quick-return mirror that preserved space behind the lens. Production cameras adopted Nikkor lenses after Olympus supplied prototype optics.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Bronica Camera List · Classic Camera Story: Zenza Bronica

Bronica followed the elaborate D with the S in 1961, simplifying the original concept while retaining a modular 6x6 focal-plane-shutter system. The C arrived in 1964 as a still more economical branch with a noninterchangeable film back. Together they turned Yoshino's showcase design into a family of cameras at different levels of complexity and price.

Bronica Camera List · Classic Camera Story: Zenza Bronica · Mr. Zenza's Rolls-Royce

The C2 and S2 appeared in 1965, and the S2 became the durable center of Bronica's mechanical 6x6 line. Period sales sheets and manuals document a broad professional system of backs, finders, and lenses. Nikkor optics were central, but other makers and later Zenzanon-branded lenses also entered the ecosystem, so the camera badge alone never settles lens manufacture.

Bronica Camera List · Classic Camera Story: Zenza Bronica · Bronica Reference Library

The EC of 1972 replaced the older mechanical architecture with an electronically controlled focal-plane shutter and a divided mirror arrangement intended to reduce vibration while clearing the lens path. The EC-TL followed in 1975 with through-the-lens aperture-priority exposure control. Bronica's patents show that this period involved original body, finder, mirror, and lens-interface engineering.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Bronica Camera List · View Finder for a Single Lens Reflex Camera, US3975750A

The 6x4.5 ETR introduced a new modular system built around electronically controlled leaf shutters in its interchangeable lenses. Flash could synchronize throughout the shutter-speed range, and the smaller format made the camera faster to handle. ETR-C, ETRS, and ETRC variants followed, while the EC-TL II closed the older focal-plane lineage in 1978.

Bronica Camera List · Zenza Bronica ETR Instructions · Means for Mounting an Interchangeable Lens on a Single Lens Reflex Camera, US4063264

Bronica returned to 6x6 with the SQ in 1980, but not to the old focal-plane mount. The SQ used its own electronically governed leaf-shutter lenses and modular backs, finders, screens, grips, and drives. SQ-A and motorized SQ-Am revisions followed in 1982. The shared Zenzanon name did not make ETR and SQ lenses interchangeable.

Bronica Camera List · Classic Camera Story: Zenza Bronica · Bronica Reference Library

The GS-1 expanded Bronica's leaf-shutter reflex idea to 6x7 in 1983. It offered interchangeable backs and finders in a larger negative format and developed into a system distinct from both ETR and SQ. By the middle of the decade Bronica could address three common professional roll-film formats without asking one mount or one lens family to cross incompatible image circles and interfaces.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Bronica Camera List · Bronica Reference Library

Founder Zenzaburo Yoshino died in November 1988, the same year the ETRSi modernized the 6x4.5 line. The SQ-Ai followed in 1990 with later-generation electronic integration. These cameras refined established professional systems rather than replacing them with a single universal platform, preserving Bronica's three-format structure into the digital transition.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Bronica Camera List · Zenza Bronica ETR Instructions

Tamron entered the medium-format camera business by acquiring shares in Bronica Co., Ltd. in July 1995. In July 1998 Bronica Co. was merged into Tamron Co., Ltd. Bronica therefore ceased to be a separate legal company even though its cameras and brand continued, a distinction that matters when attributing the late systems and their optical manufacture.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · History of TAMRON · Mr. Zenza's Rolls-Royce

Bronica introduced the RF645 in November 2000, shifting from the modular reflex to a compact 6x4.5 interchangeable-lens rangefinder with leaf shutters and program exposure. It was the final new Bronica camera. Tamron's surviving product page states that production ended in October 2005, when the Bronica camera business itself was brought to a close.

Zenza Bronica Exhibition - From the Zenza Bronica D to the Bronica RF645 · Bronica Camera List · History of TAMRON · Bronica RF645

After camera production ended, Bronica ceased to operate as an independent maker or active Tamron camera line. Tamron nevertheless retains an official Bronica model chronology and RF645 specifications on its current website, preserving a manufacturer-level record of the completed system. Surviving cameras remain serviceable artifacts, but they are not evidence of continued Bronica manufacture.

Bronica Camera List · History of TAMRON · Bronica RF645