"Sigma USB Dock (for Canon Lenses) The Sigma USB Dock works in conjunction with Sigma Optimization Pro software in order to connect a photographers lens to their computer to update firmware calibrate the lens and other customizations such as the focus parameter. For the Sports category changes can be made to: Autofocus speed focus limiters manual focus override and optical stabilization functionality. Updating the firmware can be done via the internet. Compatible with both PC and Mac."'via Blog this'
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