Four Thirds system

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What Wikipedia says

The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) design and development. Four Thirds refers to both the size of the image sensor (4/3") as well as the aspect ratio (4:3). The Olympus E-1 was the first Four Thirds DSLR, announced and released in 2003.

Excerpt from the Wikipedia article “Four Thirds system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia