The Sigma USB dock works in conjunction with Sigma Optimization Pro software in order to connect a photographers lens to their personal 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. Sigma Photo Pro is available for Mac and PC computers.

Focus Settings:

• 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).

For Sports Line:

• AF Speed: 3 adjustment modes.
• Focus Limiter: Customize auto focus range.
• OS: 3 adjustment modes.

For Windows:

• Core 2 Duo or faster processor
• Windows 7 or Windows 8
• 1GB of RAM
• 1GB of available hard disk space
• 24bit or more graphics card
• 1024 x 768 or higher screen resolution
• PC with USB 1.1 port

For Mac OS:

• Mac OS X Ver.10.7 or 10.8 and Intel Core Processor
• 1GB of RAM
• 1GB of available hard disk space
• 24bit or more graphics card
• 1024 x 768 or higher screen resolution
• PC with USB 1.1 port