From Sigma: Thank you for purchasing and using our products.
We would like to announce that a new firmware update for the SIGMA 24-70mm F2.8 DG OS HSM | Art for SIGMA, Canon and Nikon is now available
This firmware update improves the stability of the image in the viewfinder, making it easier to confirm composition.
For customers who own the SIGMA USB DOCK and applicable product listed below, please update the firmware via SIGMA Optimization Pro. Before updating the firmware using the SIGMA USB DOCK, please ensure to update SIGMA Optimization Pro to Ver.1.4.1 or later for Windows, and Ver.1.4.0 or later for Macintosh.
Benefit of the update