Canon EOS RP Instruction Manual page 335

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