M4 or M-4 most often refers to:
A rangefinder camera is a camera fitted with a rangefinder, typically a split-image rangefinder: a range-finding focusing mechanism allowing the photographer to measure the subject distance and take photographs that are in sharp focus. Most varieties of rangefinder show two images of the same subject, one of which moves when a calibrated wheel is turned; when the two images coincide and fuse into one, the distance can be read off the wheel. Older, non-coupled rangefinder cameras display the focusing distance and require the photographer to transfer the value to the lens focus ring; cameras without built-in rangefinders could have an external rangefinder fitted into the accessory shoe. Earlier cameras of this type had separate viewfinder and rangefinder windows; later the rangefinder was incorporated into the viewfinder. More modern designs have rangefinders coupled to the focusing mechanism so that the lens is focused correctly when the rangefinder images fuse; compare with the focusing screen in non-autofocus SLRs.
135 film, more popularly referred to as 35 mm film or 35 mm, is a format of photographic film used for still photography. It is a film with a film gauge of 35 mm (1.4 in) loaded into a standardized type of magazine – also referred to as a cassette or cartridge – for use in 135 film cameras. The engineering standard for this film is controlled by ISO 1007 titled '135-size film and magazine'.
Leica Camera AG is a German company that manufactures cameras, optical lenses, photographic lenses, binoculars, and rifle scopes. The company was founded by Ernst Leitz in 1869, in Wetzlar, Germany. The name Leica is derived from the first three letters of the founder's surname (Leitz) and the first two of the word camera: lei-ca.
Minolta Co., Ltd. was a Japanese manufacturer of cameras, camera accessories, photocopiers, fax machines, and laser printers. Minolta Co., Ltd., which is also known simply as Minolta, was founded in Osaka, Japan, in 1928 as Nichi-Doku Shashinki Shōten. It made the first integrated autofocus 35 mm SLR camera system. In 1931, the company adopted its final name, an acronym for "Mechanism, Instruments, Optics, and Lenses by Tashima".
The British Royal Navy M-class submarines were a small class of diesel-electric submarines built during World War I. The unique feature of the class design was a 12-inch (305 mm) gun mounted in a casemate forward of the conning tower.
Contax began as a German camera model in the Zeiss Ikon line in 1932, and later became a brand name. The early cameras were among the finest in the world, typically featuring high quality Zeiss interchangeable lenses. The final products under the Contax name were a line of 35 mm, medium format, and digital cameras engineered and manufactured by Japanese multinational Kyocera, and featuring modern Zeiss optics. In 2005, Kyocera announced that it would no longer produce Contax cameras. The rights to the brand are currently part of Carl Zeiss AG, but no Contax cameras are currently in production, and the brand is considered dormant.
The Leica M3 is a 35 mm rangefinder camera by Ernst Leitz GmbH, introduced in 1954. It was a new starting point for Leitz, which until then had only produced screw-mount Leica cameras that were incremental improvements to its original Leica (Ur-Leica). The M3 introduced several features to the Leica, among them the combination of viewfinder and rangefinder in one bright window, like on the Contax II, a bayonet lens mount, and rapid film advance lever. It was the most successful model of the M series, with over 220,000 units sold by the time production of the M3 model ended in 1966.
The Leica M6 is a rangefinder camera manufactured by Leica from 1984 to 1998, followed by the M6 "TTL" manufactured from 1998 to 2002. In 2022, Leica introduced a new camera based on the technology of the Leica MP but staying true to the design of the M6.
The Olympus OM-1 is a manually operated 35mm single-lens reflex camera. It is part of the Olympus OM system.
The Leica M mount is a camera lens mount introduced in 1954 with the Leica M3, and a range of lenses. It has been used on all the Leica M-series cameras and certain accessories up to the current film Leica M-A and digital Leica M11 cameras.
The Leica M2 is a 35 mm rangefinder camera by Ernst Leitz GmbH of Wetzlar, Germany, introduced in 1957. Around 82,000 M2s were produced between 1957 and 1968. Around 1500 M2s were produced by Ernst Leitz Canada, but most of these are not marked as such on the top plate.
The Konica Hexar RF is a 35 mm rangefinder camera which was sold by Konica. It was introduced to the market on 13 October 1999. and subsequently discontinued some time before the end of 2003. The camera used the "Bayonet Konica KM-mount", a copy of the Leica M-mount, thus sharing interchangeable lenses with those designed for Leica cameras and others compatible with them. The Hexar RF has a combined rangefinder/viewfinder modeled on that of Leica cameras, a similar body shape and size - and so is similar to Leica M-mount cameras in many aspects of operation.
The Minolta CLE is a TTL-metering automatic exposure aperture-priority 35 mm rangefinder camera using Leica M lenses, introduced by Minolta in 1980.
The Leica M4 is a 35 mm rangefinder camera produced by Ernst Leitz GmbH.
The Leica M5 is a 35 mm camera by Leica Camera AG, introduced in 1971. It was the first Leica rangefinder camera to feature through-the-lens (TTL) metering and the last to be made entirely in Wetzlar by hand using the traditional "adjust and fit" method.
Leica R4, R5, R6, R7 were 35 mm SLR cameras manufactured by Leica between 1980 and 1997 and belonged to the manual focusing R-System, which was offered from 1965 to 2009.
The Leica M-A is a purely mechanical 35 mm rangefinder camera released by Leica Camera AG in 2014. The camera has no exposure meter, no electronic control, and no battery is required to operate it. The camera is Leica's first purely mechanical camera since the release of the Leica M4-P in 1981.
The Leica S-System is a medium format digital single lens reflex camera system introduced by Leica Camera in 1996. Beginning with the Leica S1, a prototype top-end studio digital camera unveiled at Photokina 1996. It went into production at the end of 1997.
The Leicaflex series of high-end single-lens reflex 35 mm format film cameras were introduced by Leitz Camera in 1964. The first camera body was paired with the new R bayonet series of lenses. Three model of the cameras were sold by Leitz; the Leicaflex Standard, the Leicaflex SL and the Leicaflex SL2.
