Sigma USB Dock for Canon EOS Lenses

Using this handy accessory from Sigma, you can connect your compatible Sigma lens to your computer and update the firmware of the lens, the focus position and additional functions. The Sigma USB dock is a great way to get the most from your high-performance Sigma lens. AF speed, focus limiter settings and OS functionality can also be adjusted with the use of the Sigma USB Dock. Different types of Sigma lenses are compatible with different features. For example, there are 4 categories of customisation for fixed focal length lenses and 16 categories for zoom lenses. With select lenses, it is possible to adjust the timing of the full-time MF function, as well as how much the focus ring should be rotated to adjust the focus manually. Key Points Compatible with select Sigma lenses Keep your firmware up-to-date Adjust AF speed, AF limiter & OS Compatible with Downloadable Sigma Optimization Pro Software