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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.
百度热搜以数亿用户海量的真实数据为基础，通过专业的数据挖掘方法，计算关键词的热搜指数，旨在建立权威、全面、热门、时效的各类关键词排行榜，引领热词阅读时代。
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