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March 19, 2010 15:02 ET | Source: Sigma Corporation of America

Sigma Corporation's New APO 50-500mm F4.5-6.3 DG OS HSM Now on Shelves

RONKONKOMA, NY--(Marketwire - March 19, 2010) - Sigma Corporation (www.sigmaphoto.com), a leading researcher, developer, manufacturer and service provider of some of the world's most impressive...