Sigma Unveils Two 150-600mm F/5-6.3 DG OS HSM Lens Models September 15, 2014 By Eric Reagan Sigma 150-600mm f5-6.3 DG OS HSM Sports Sigma has announced a pair of 150-600mm F/5-6.3 DG OS HSM lenses – one in its Sports line and one in its Contemporary line. They vary in use and design. [Read more…]