Sigma has released a new firmware update for Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary lens for Canon EF-mount (Amazon/B&H Photo/Adorama). Version 1.02 of the firmware fixes problems with the optical image stabilization when the lens is attached to Sigma’s Sony E-mount converter MC-11 EF-E.
● It has corrected the phenomenon that the OS mechanism does not operate properly when attached to the SIGMA MOUNT CONVERTER MC-11 EF-E.
Users can use Sigma USB dock can update the firmware via the Sigma Optimization Pro software. Users who own the MC-11 converter can update by connecting the latter to a computer via USB-cable. In both cases, you should make sure you are running the latest version of Sigma Optimization Pro which is 1.4.1 for Windows and 1.4.0 for Macintosh computers.