Last year, Sigma unveiled a line of telephoto zoom lenses at PMA 2008 with HSM and OS (mechanical Optical Stabilizer). This year at PMA 2009, Sigma is adding length to its series of zoom lenses, ranging from 10mm to 250mm. The 18-250mm F3.5-F6.3 DC OS HSM announced two weeks prior to PMA 2009.
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