Canon EOS R6 Advanced User Guide - Page 196

3. Select a setting. Confirm that the name of the attached lens and (except for diffraction correction) [Correction data available] are displayed. If [Correction data not available] or [ ] is displayed, see Digital Lens Optimizer. Caution Not available when shooting multiple exposures. Peripheral Illumination Correction Vignetting (dark image corners) can be corrected. Caution Depending on shooting conditions, noise may appear on the image periphery. The higher the ISO speed, the lower the amount of correction will be. Note The amount of correction applied will be lower than the maximum correction amount applied with Digital Photo Professional (EOS software). Peripheral illumination is corrected automatically in < data is registered on the camera. > mode when correction 196