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Sigma Corporation of America is a subsidiary of the Sigma Corporation, a Japanese based family owned manufacturer of DSLR cameras, camera lenses and camera accessories. Founded in 1961, Sigma Corporation prides itself on high quality and innovative photographic equipment.
图说天下网是图说天下艺术传播机构主办的网络平台，致力于打造国际领先的在线艺术社区、美术馆、电子商务平台。图说天下，艺术你的生活。
《服装学报》;
