Sigma Corporation is an electronic company based in Japan that specializes in manufacturing accessories required for photography like camera, lens, flash etc. They have a factory in Bandai in Japan named Aizu, which manufactures these products. However, the headquarters of the company is in Kawasaki, Kanagawa in Japan.
Sigma Corporation was founded by Michihiro Yamaki in 1961. He went on to be the CEO of the company and worked at the same position till his death in 2012. In these years, the company was propelled to new heights and a number of photographic products were introduced into the market. Though they have their own line of cameras, they also manufactured other camera accessories that would be compatible not only with their line of cameras but with other well known brands as well.