Four Thirds Standard in DSLR is a matched standard for lens mounts. It was present from the beginning regardless of lenses, cameras or sensor sizes. This allowed to solve compatibility issues with legacy components and the compromises in the design of new components. The first such camera with Four Thirds Standard, was the Olympus E-1, which was introduced in 2003. The standard of
Four Thirds Standard defines, among other things; the sensor dimension, the lens mount including the protocol, the imaging circle, the flange focal length (38.85 mm), optical requirements such as the maximum angle between incident rays on the sensor.…

Digital Photography, Image, System

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