Sigma 24-70mm and 50-500mm Lens Deals December 13, 2012 By Eric Reagan B&H has a couple of good deals on some of the better Sigma lenses The Sigma 24-70mm f/2.8 IF EX DG HSM is $694 (reg. $769 – it’s currently $824 at Amazon). Check it out here at B&H Photo. The Sigma 50-500mm f/4.5-6.3 DG OS HSM APO lens is $1299 (reg. $1449). Check it out here at B&H Photo.