Olympus Imaging Corporation, Matsushita Electric Industrial Co., Ltd. and Sigma Corporation have jointly compiled a detailed catalogue of exchangeable lenses for their digital single-lens reflex camera systems based on the Four-Thirds standard. Supporting companies of Four-Thirds include:
Eastman Kodak Company, Fuji Photo Film Co., Ltd., Leica camera AG, Matsushita Electric Industrial Co., Ltd., Olympus Imaging Corp., Sanyo Electric Co., Ltd., and Sigma Corporation,
"The core design concept of the Four Thirds system is to facilitate optimization of the size, performance, and extendibility of digital cameras and lenses. In addition, a standardized lens mount allows photographers to freely combine interchangeable lenses and cameras from different manufacturers. This is the key feature of the Four Thirds system, the one that makes it possible to explore the full potential of digital photography."
Four-thirds.org site
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