Canon EOS RP Advanced User Guide - Page 127

Correction of Lens Aberrations due to Optical Characteristics General Cautions for Lens Aberration Correction ooPeripheral illumination correction, chromatic aberration correction, distortion correction, and diffraction correction cannot be applied to JPEG images already taken. ooWhen using a non-Canon lens, setting the corrections to [Disable] is recommended even if [Correction data available] is displayed. ooMagnifying the periphery of the image may display parts of the image that will not be recorded. ooThe correction amount will be less (except for diffraction correction) if the lens used does not have distance information. General Notes for Lens Aberration Correction ooThe effect of the lens aberration correction varies depending on the lens used and shooting conditions. Also, the effect may be difficult to discern depending on the lens used, shooting conditions, etc. ooIf the correction is difficult to discern, magnifying and checking the image after shooting is recommended. ooCorrections can be applied even when an extender or life-size converter is attached. ooIf the correction data for the attached lens is not registered to the camera, the result will be the same as when the correction is set to [Disable] (except for diffraction correction). ooIf necessary, refer to the EOS Utility Instruction Manual as well. 127