Firmware update improves AF performance of Sigma 100-400mm F5-6.3 DG OS HSM lens for Canon
T table1349 Been spending a lot of time on here! Joined Sep 9, 2006 Messages 0 Reaction score 2,772 Jun 7, 2017 #1 Firmware update improves AF performance of Sigma 100-400mm F5-6.3 DG OS HSM lens for Canon