From Sigma:
Thank you for purchasing and using our products.
We would like to announce that, as of this moment SIGMA’s interchangeable lenses for Canon mount in the current lineup do not have any issues with general operation when they are used on the “EOS R”, released by Canon Inc., via their “Mount Adapter EF-EOS R”.
In addition, please note the information below when using our lenses.
1. With SIGMA’s interchangeable lenses, the Digital Lens Optimizer located within the in-camera Lens Aberration Correction function cannot be used. Therefore, please set the Digital Lens Optimizer to [OFF] before shooting.
When the Digital Lens Optimizer is switched [OFF], but “Peripheral illumination correction”, “Chromatic aberration correction” and “Distortion correction”, located within the in-camera Lens Aberration Correction function is switched [ON], the appropriate corrections can be achieved in accordance with the optical characteristics of each lens. This is applicable to lenses listed below which were released after March, 2018, or those of which firmware has been updated to Ver.2.0 or later.
Contemporary line
Art Line
Sports Line
* These lenses will be compatible with the in-camera Lens Aberration Correction function by a firmware update to Ver.2.0 which will be announced in the future.
When lenses other than those listed above are used, “Peripheral illumination correction”, “Chromatic aberration correction” and “Distortion correction”, located within the in-camera Lens Aberration Correction function, may cause images to appear abnormal. Therefore please set these correction functions to [OFF] before shooting.
2. When SIGMA’s DC lenses are used, “1.6x (Crop)” will not be set automatically. Please select “1.6x (Crop)” manually.
We will continue verification and provide updates on the operating condition at a later date.