Sassan,
The 4/3rds mount is the lens mount used by Olympus, Leica and a couple of other brands. The sensor in a 4/3rds camera is a bit smaller than the more common APS-C sized sensor used in many other dSLRs, this gives a 2x crop factor, instead of the more typical 1.5x digital sensor crop factor found on an APS-C sized dSLR.
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