SIGMA USB Dock / SIGMA Optimization Pro Based on the new product lines in cooperation with the USB Dock, SIGMA has developed a special software (SIGMA Optimization Pro) with which the lens firmware can be updated and, for example, focus parameters adjusted. The USB dock was developed for all lenses of the new product lines S | Sports, A | Art and C | Contemporary. Using this special USB dock, the user can connect the lens to their PC and use the easy-to-use menu control on the screen. More information about the USB dock and the software can be found in the user manual here: http://www.sigmafoto.de/fileadmin/content/products/accessoires/USB_Doc k / SIGMA_PR_photokina2012_de_.pdf