Get your Sigma Lenses (Canon EF mount only) up to date. Update the lens firmware to improve the lens performance. $10 for the first lens, $5 for any lenses after Sigma lenses for Canon EF and MC-11 adapter may need firmware update, I will upgrade the firmware for you just like this : https://www.sigma-global.com/en/download/lenses/tutorial/ Please see https://www.sigmacanada.ca/en/sigma-usb-dock for USB DOCK COMPATIBILITY CHART https://www.sigma-global.com/en/download/lenses/firmware/