The Sigma USB Dock for Canon Lenses offers Sigma lens users to connect Sigma Global Vision lenses to a computer and update firmware or adjust focus setting parameters. These changes are made using the Sigma Optimization Pro software.
Some changes available using the Sigma USB Dock for Canon lenses are four categories for prime lenses and 16 categories (four options for focal length, four options for shooting distance) for zoom lenses available. These categories allow you to adjust certain focusing settings to better suit your personal shooting style. The Sports line of lenses has a different configuration of 3 AF speed modes which will help to quickly capture sports action in a snap.