We would like to announce that a firmware update for the SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary for CANON and SIGMA MOUNT CONVERTER MC-11 EF-E is now available. This firmware update corrects the phenomenon that the OS mechanism does not operate properly when attached to the SIGMA MOUNT CONVERTER MC-11 EF-E. For customers … Continue reading SIGMA MC-11 Firmware Update