Sigma 105mm f/2.8 EX DG OS Macro HSM Lens for $669 – Deal Alert December 1, 2013 By Eric Reagan B&H has the Sigma f/2.8 EX DG OS Macro lens for $669 (reg. $969) with free shipping and 4% rewards. The lens is available for Canon, Nikon, Sony and Sigma mounts. Check it out here at B&H Photo. Keep up with all of the latest deals on our Black Friday & Cyber Monday Deals page.