From Sigma:
Thank you for purchasing and using our products.
We would like to announce that a new firmware update for SIGMA interchangeable lenses for Canon is now available.
This firmware allows compatibility with Canon’s in-camera Lens Aberration Correction function to enable correction matching the optical characteristics of each lens. It also corrects the phenomenon that abnormal images appear or operation errors occur when the function is enabled.
For customers who own the SIGMA USB DOCK and applicable products listed below, please update the firmware via SIGMA Optimization Pro.
Before updating the firmware using the SIGMA USB DOCK, please ensure to update SIGMA Optimization Pro to Ver. 1.4.1 or later for Windows, and Ver. 1.4.0 or later for Macintosh.
Downlad: SIGMA Optimization Pro
Applicable products
Benefits of the update
* Compatible Canon camera models:EOS 1DX mark II, EOS 5Ds, EOS 5DsR, EOS 5D mark IV, EOS 6D Mark II, EOS 80D, EOS 8000D, (EOS Rebel T6s, EOS 760D, EOS 9000D), (EOS 77D, EOS Kiss X8i), (EOS Rebel T6i, EOS 750D, EOS Kiss X9i, (EOS Rebel T7i, EOS 800D, EOS Kiss X9), (EOS Rebel SL2, EOS 200D)
B&H carries Sigma Art and Contemporary lenses.