By connecting the USB cable to a computer, Sigma USB Dock enables photographers to update the lens firmware and adjust parameters such as focus. It is designed exclusively for use with the new Contemporary, Art and Sports product lines of the Sigma Global Vision range. The adjustment is processed with special software (SIGMA Optimization Pro). The AF speed, focus limiter and OS function are also customisable for Sports lenses.The Sigma USB dock will not work with Sigma’s existing lenses and has been specifically designed for their new line of lenses, such as the Sigma 17-70mm f2.8-4 DC Macro OS HSM, 35mm f1.4 DG HSM, 30mm f1.4 DC HSM, 18-35mm f1.8 DC HSM, 24-105mm f2.8 DG OS HSM, 50mm f1.4 DG HSM, 18-200mm f3.5-6.3 SC Macro OS HSM and 120-300mm f2.8 DG OS HSM lenses. 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).Sports Line:AF Speed: 3 adjustment modes. Focus Limiter: Customize auto focus range. OS: 3 adjustment modes.Condition of Operation: WindowsThis software operates in the condition that meets with the following criteria;Core2Duo or faster processorWindows 7 or Windows 81GB of available hard drive space24-bit graphics card (approx. 16.7 million colors)1024 x 768 or higher screen resolutionUSB 1.1 as standardCondition of Operation: Mac OS This software operates in the condition that meets with the following criteria;Mac OS X Ver.10.7 or 10.8 and Intel Core Processor1GB of RAM1GB of available hard disk space24bit or more graphics card1024 x 768 or higher screen resolutionUSB 1.1 as standard

By connecting the USB cable to a computer, Sigma USB Dock enables photographers to update the lens firmware and adjust parameters such as focus. It is designed exclusively for use with the new Contemporary, Art and Sports product lines of the Sigma Global Vision range. The adjustment is processed with special software (SIGMA Optimization Pro). The AF speed, focus limiter and OS function are also customisable for Sports lenses.The Sigma USB dock will not work with Sigma’s existing lenses and has been specifically designed for their new line of lenses, such as the Sigma 17-70mm f2.8-4 DC Macro OS HSM, 35mm f1.4 DG HSM, 30mm f1.4 DC HSM, 18-35mm f1.8 DC HSM, 24-105mm f2.8 DG OS HSM, 50mm f1.4 DG HSM, 18-200mm f3.5-6.3 SC Macro OS HSM and 120-300mm f2.8 DG OS HSM lenses. 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).Sports Line:AF Speed: 3 adjustment modes. Focus Limiter: Customize auto focus range. OS: 3 adjustment modes.Condition of Operation: WindowsThis software operates in the condition that meets with the following criteria;Core2Duo or faster processorWindows 7 or Windows 81GB of available hard drive space24-bit graphics card (approx. 16.7 million colors)1024 x 768 or higher screen resolutionUSB 1.1 as standardCondition of Operation: Mac OS This software operates in the condition that meets with the following criteria;Mac OS X Ver.10.7 or 10.8 and Intel Core Processor1GB of RAM1GB of available hard disk space24bit or more graphics card1024 x 768 or higher screen resolutionUSB 1.1 as standard