Sigma APO 70-200mm f2.8 EX DG OS HSM April 3, 2018 by Sigma APO 70-200mm f2.8 EX DG OS HSM-1 Sigma APO 70-200mm f2.8 EX DG OS HSM-3 Sigma APO 70-200mm f2.8 EX DG OS HSM-2