Keep your lens primed and updated for the best photography with the Sigma USB Dock for Pentax Lenses. This ingenious device works with Sigma Optimization Pro software, and allows you to connect your lens to your computer and update its firmware or tweak its settings. You can alter parameters like focus and for the sports category; and adjust autofocus speeds, focus limiters, and optical stabilization functionality. Updating the lens firmware is easy as you can directly connect to the internet via your computer. The Sigma USB Dock is compatible with all Global Vision Lenses, except DN lenses.