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The Panasonic Lumix DMC-G2 by Carol F. Roullard, Brian Matsumoto Ph.D

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The Four Thirds System

The Micro Four Thirds system evolved from the earlier Four Thirds system design that was developed by Olympus and Kodak and was based on using a sensor with a 4:3 aspect ratio, hence its name. Associated with the sensor was a standardized lens mounting system. The small sensor size (half the dimensions of a 35mm negative) would enable the manufacturer to design smaller camera bodies and lenses.

In addition, a new bayonet-type mount with electrical contacts provided communication between lens and camera body so that the unit would be able to have automatic focusing and automatic exposure. By establishing and defining this standard, it was hoped other manufacturers would design camera bodies and lenses compatible with the system. ...

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