Sigma Corporation's New APO 70-200mm F2.8 EX DG OS HSM Lens Now Available
August 02, 2010 10:03 ET | Sigma Corporation of America
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...