Sigma USB Dock - L-Mount Category_Stools & Steps The EF 600mm f/4L IS

The EF 600mm f/4L IS III USM offers professional and advanced photographers the excellent image quality of a Canon L series super telephoto lens in a significantly lighter body than its predecessor

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Sigma USB Dock - L-Mount Category_Stools & Steps The EF 600mm f/4L ISBy connecting the USB cable to a computer, SIGMA USB DOCK enables photographers to update the lens firmware and adjust parameters such as focus. The adjustment is processed with special software (SIGMA Optimization Pro). The AF speed, focus limiter and OS function are also customizable for Sports lenses.