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August 02, 2010 10:03 ET | Source: Sigma Corporation of America

Sigma Corporation's New APO 70-200mm F2.8 EX DG OS HSM Lens Now Available

RONKONKOMA, NY--(Marketwire - August 2, 2010) - Sigma Corporation of America (www.sigmaphoto.com), a leading researcher, developer, manufacturer and service provider of some of the world's most...