Sigma GlobalVision USB Dock for Nikon

Quick Overview Update Lens Firmware Customize: Autofocus, OS, Focus Compatible with Global Vision Lenses (except DN lenses) For MC-11 updates, Product Description SIGMA Optimization Pro For Windows:Your computer must meet the following criteria for the software to operate:  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:Your computer must meet the following criteria for the software to operate:  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