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...

Sigma Corporation of America Launches Family-Centric Photo Contest for Moms RONKONKOMA, NY--(Marketwire - June 30, 2010) -  Sigma Corporation of America (www.sigmaphoto.com) is kicking off the start of summer with a fun and exciting photography contest geared toward moms...

Sigma Corporation of America Launches New, Interactive Community Web Site RONKONKOMA, NY--(Marketwire - February 24, 2010) - Sigma Corporation (www.sigmaphoto.com), a leading researcher, developer, manufacturer and service provider of some of the world's most impressive...