12 and 12 researched events on one shared scale. Mamiya 1940–present, Yashica 1949–present.
The axis stretches where either maker has research and collapses where neither does, so a year sits opposite the same year on both. Event counts differ because research depth differs, not because one company did less.
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.
Mamiya Camera Exhibition: The History of Invention and Ingenuity · Corporate history · 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.
Mamiya Camera Exhibition: The History of Invention and Ingenuity · Corporate history · Mamiya 6 Model V (1953)
Yoshimasa Ushiyama's Lake Suwa workshop began with electric-clock components, then entered camera manufacture through the Pigeonflex and early Yashimaflex/Yashicaflex twin-lens reflexes. The move joined precision mechanics to a fast-growing Japanese export industry and created the product name that soon became the company name.
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 Sekor Guide · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya TLR System Summary
Yashicaflex, Yashica A, C, D, LM, 635, Mat and related models built a broad medium-format range. The cameras evolved through crank winding, meters, 127 and 120/220 formats, and changing Yashimar, Yashikor, Lumaxar and Yashinon lens packages while retaining the familiar waist-level reflex form.
A United States sales organization, movie cameras and the first Yashica 35 rangefinder widened the business beyond TLRs. In September 1958 the legal maker became Yashica Co., Ltd.; period cameras show the change from Yashima to Yashica markings more reliably than the simplified chronology in later promotional literature.
Yashica the Company - Success & Failure · Yashica TLR Brochures · Yashica Timeline
Yashica acquired Nicca's 35mm rangefinder operation, marketed the YE and YF, and absorbed the subsidiary over a longer interval than many summaries imply. Nicca experience contributed to Yashica's move toward interchangeable-lens cameras, although sources differ on the acquisition month and final legal absorption date.
Yashica the Company - Success & Failure · Yashica / CONTAX - Camera List
The Pentamatic introduced Yashica's proprietary-bayonet 35mm SLR system, but its short production life was followed by the Penta J and J series using the widely shared M42 screw mount. Yashinon lenses could now travel across makers' bodies, and Yashica gained a more practical platform for its growing SLR range.
Yashica / CONTAX - Camera List · November 1968 Yashica catalog pages · Yashica Timeline
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.
Mamiya Sekor Guide · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya TLR System Summary · Corporate history
The Electro 35 family turned electronic shutter timing and aperture-priority exposure into a simple rangefinder experience. Successive G, GS, GT, GSN, GTN, CC and MC versions made the concept one of Yashica's defining products, even though the often-quoted lifetime production total is not supported by a surviving factory ledger.
Tomioka Optical, already a Yashica lens supplier, came under Yashica capital in 1968. It produced SLR and other lenses, joined Kyocera with Yashica in 1983 and became Kyocera Optec in 1991, preserving an optical-manufacturing line that outlasted Yashica-branded camera production.
History | Optical Components (Lenses and Optical Units) · Yashica the Company - Success & Failure · November 1968 Yashica catalog pages
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.
Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya RB67 Pro-S instruction manual · Corporate history
Yashica's cooperation with Carl Zeiss produced the Contax RTS and the shared Contax/Yashica bayonet. Zeiss supplied premium optical designs, while Yashica offered FX and FR bodies plus Yashica-branded DSB and ML lenses, creating an interoperable 35mm system without collapsing the partners' distinct design attributions.
History | Optical Components (Lenses and Optical Units) · Contax/Yashica Filters & Lens Shades · Yashica Timeline
The FX-1, FX-2, FR, FR I and FR II developed the consumer side of the shared mount, while the mechanically governed FX-3 became a long-lived entry body. Yashica ML lenses ranged from fisheye and fast normals to macro, mirror and zoom designs, sharing the bayonet and accessories with many Contax bodies.
Yashica / CONTAX - Camera List · Contax/Yashica Filters & Lens Shades
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 Sekor Guide · Mamiya Camera Exhibition: The History of Invention and Ingenuity · Mamiya RZ67 Pro II instruction manual · JPS58100115A — Zoom lens
Yashica Co., Ltd. merged into Kyocera in October 1983. Yashica continued as a consumer camera brand beside premium Contax products, with overseas manufacturing, autofocus SLRs, compact cameras, Samurai half-frame models and specialist Dental-Eye bodies extending the catalog into the digital transition.
Annual Report 2005 · Yashica / CONTAX - Camera List · Yashica Timeline · 1980- | History | About the Kyocera Group
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.
Mamiya Camera Exhibition: The History of Invention and Ingenuity · Corporate history
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
Kyocera reported that intense digital-camera competition and inadequate cost reductions forced a major downsizing of its optical equipment group. Overseas sales companies closed, domestic camera operations contracted and the Yashica/Contax camera-making era ended, although Kyocera's optical-components business continued.
History | Optical Components (Lenses and Optical Units) · Annual Report 2005
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.
The Yashica badge entered a new Hong Kong-based trademark chapter and now appears on products promoted through a current YASHICA business. Separately, the Tomioka-derived Kyocera Optec operation continued industrial optical work and became Kyocera's Optical Components Division, so brand revival and manufacturing continuity are distinct stories.
History | Optical Components (Lenses and Optical Units) · Trade Mark Registrations Renewed, Journal No. 699 · Our History
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.
Schneider Kreuznach, Phase One, Mamiya Digital Imaging Cooperate to Drive Innovations in Medium Format Digital Lenses · Phase One Invests in Mamiya Digital Imaging · Mamiya and Leaf brands and lineups consolidate
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.
Which products can I get help with from Phase One and Mamiya-Leaf Technical Support · Leaf Shutter Lenses · Phase One · About Phase One · Phase One Japan established and succeeds Mamiya optical business · Phase One Unveils the Future of High-End Photography
