Sigma 10-20mm f3.5 EX DC-1 October 17, 2017 by Sigma 10-20mm f3.5 EX DC-4 Sigma 10-20mm f3.5 EX DC-3 Sigma 10-20mm f3.5 EX DC-1 Sigma 10-20mm f3.5 EX DC-5 Sigma 10-20mm f3.5 EX DC-2