updated 11:30 am EST, Thu January 26, 2012
Japan's Astrodesign also joins the standard
Two Japanese camera lens manufacturers have signed onto the Micro Four Thirds standard pioneered by Olympus and Panasonic. They include Kenko Tokina and Tamron, while a third Japanese company, Astrodesign, has also jumped onboard, though it makes video measuring equipment and not lenses. This should give those how have bought into the new type of camera, which allows for interchangeable lenses on digital camera bodies that are smaller than DSLRs, more options for lenses.
Sony, Samsung, Nikon, Pentax, and Fujifilm all have their own standards for mirrorless interchangeable lens cameras' mounts as well. Micro Four Thirds is the only system that isn't locked to one camera maker, although Olympus and Panasonic are virtually the only participants for regular cameras.
Astrodesign was established in 1977, and was the first programmable signal generator and Ultra HDTV image processor devices used at Expo 2005. Kenko Tokina dates back to 1957 and is Japan's largest maker of lens filters but makes F-mount lenses as well. Adapters and extension tubes are made as well. Tamron is the oldest, founded in 1950, and develops SLR lenses and advanced optical components. [via CNET and 4/3 Rumors]