"Manual Override function is unavailable with this camera. Full-time manual function can be offered. When using a Sigma interchangeable lens, setting the corrections to 'Disable' is recommended, as 'Lens Correction' functions of the camera (such as Peripheral Illumination Correction, Chromatic Aberration Correction, Diffraction Correction, and Distortion Correction) are not supported."

"We have found that some Sigma interchangeable lenses for Canon are not fully compatible with the 6D Mark II, 77D, Rebel T7i, Rebel SL2. When attached to these cameras and the 'Lens aberration correction' function is on and these cameras are set to 'Enable' for Live View shooting, then an error will occur. Please set the 'Lens aberration correction' function of these cameras to 'Disable' when using Sigma's interchangeable lenses for Canon."