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The Micro Four Thirds system (MFT or M4/3 or M43) (マイクロフォーサーズシステム, Maikuro Fō Sāzu Shisutemu) is a standard released by Olympus Imaging Corporation and Panasonic in 2008, [1] for the design and development of mirrorless interchangeable lens digital cameras, camcorders and lenses. [2]
The Micro Four Thirds system (MFT) of still and video cameras and lenses was released by Olympus and Panasonic in 2008; lenses built for MFT use a flange focal distance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13.0 mm (21.6 mm diagonal).
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
The Four Thirds System was created by Olympus and Kodak in 2001, and is designed exclusively for digital cameras. [7] It is a semi-open standard that may be licensed by third parties. Currently Olympus, Leica (in cooperation with Panasonic ), and Sigma are making lenses under Four Thirds System consortium licensing.
The final Four Thirds camera, the Olympus E-5, was released in 2010. [13] In 2013, Olympus released the Olympus E-M1, which is a Micro Four Thirds camera with enhanced support for legacy Four Thirds lenses using on-chip phase detection autofocus. [14] Olympus discontinued production of the Zuiko Digital lenses for Four Thirds in 2017. [15]
Most consumer-level DSLRs, SLTs and mirrorless cameras use relatively large sensors, either somewhat under the size of a frame of APS-C film, with a crop factor of 1.5–1.6; or 30% smaller than that, with a crop factor of 2.0 (this is the Four Thirds System, adopted by Olympus and Panasonic).
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