Sigma USB Dock For Canon Mount 
Sigma USB Dock For Canon Mount
Availability: Ordered In Upon Purchase
The Sigma USB Dock For Canon Mount  works in conjunction with Sigma Optimization Pro software in order to connect a photographers lens to their personal computer to update firmware and other parameters.
Parameters such as focus, and for the Sports category: Autofocus speeds, focus limiters, and optical stabilization functionality. Updating the firmware can be done via the internet. Sigma Photo Pro is available for Mac and PC computers.
The Sigma USB dock is compatible with the following lenses:
- 35mm F1.4 DG HSM | Art
- 30mm F1.4 DC HSM | Art
- 17-70mm F2.8-4 DC MACRO OS HSM | Contemporary
- 17-70mm F2.8-4 DC MARO HSM | Contemporary
- 120-300mm F2.8 DG OS HSM | Sports
Micro Tune, Customize, and Update Your Lens
- Update Lens Firmware
- Customize: Autofocus, OS, Focus
- Compatible with Global Vision Lenses (except DN lenses)
4 Categories of customization for fixed focal length.
16 Categories of customization for zoom lenses (4 options for focal length) x (4 options for shooting distance).Sports Line:
AF Speed: 3 adjustment modes.
Focus Limiter: Customize auto focus range.
OS: 3 adjustment modes.