Sigma 878306 USB Dock Mount for Nikon Lens Black

For use with Sigma ’s Global Vision lenses. Update lens firmware so your lens is never “out of date” Adjust focus position to match your camera for precise auto focusing Customise features including autofocus speed and focus limiter distances on Sigma ’s “Sport” lenses Note On the 35mm F1.4 A Lens the dock will allow you to update firmware on the lens and also adjust front and back focusing Free download of Sigma Optimization Pro, compatible with Windows and Mac computers