フォーサーズシステム
The Micro Four Thirds (MFT) system design standard was jointly announced in 2008 by Olympus and Panasonic, as a further evolution of the similarly named predecessor Four Thirds System pioneered by Olympus. The Micro Four Thirds system standard uses the same sized sensor as the original Four Thirds system, which is half the size of a 35mm camera sensor. One advantage of the smaller sensor is smaller and lighter lenses, but one disadvantage is lower image quality. For example, a typical Olympus MFT M.Zuiko 14-42mm f/3.5-5.6 kit lens weighs 112g, is 56mm in diameter and 50mm in length. The equivalent Canon APS-C DSLR EF-S 18-55mm f3.5-5.6 kit lens weighs 190g, and is 69mm in diameter and 80mm in length In 35mm camera format the Micro Four Thirds system sensor has a 2× magnification factor on its lenses whereas the APS-C sized sensor cameras have 1.6× magnification factor.