Canon EOS M6 Mark II Advanced User's Manual page 132

Lens Aberration Correction
Digital Lens Optimizer
Various aberrations from lens optical characteristics can be corrected, along
with diffraction and low-pass filter-induced loss of clarity.
If [Correction data not available] or [ ] is displayed by [Digital Lens
Optimizer], you can use EOS Utility to add the lens correction data to the
camera. For details, refer to the EOS Utility Instruction Manual.
Depending on shooting conditions, noise may be intensified together with the
z
effects of correction. Image edges may also be emphasized. Adjust Picture
Style sharpness or set [Digital Lens Optimizer] to [Disable] as needed before
shooting.
The higher the ISO speed, the lower the correction amount will be.
z
For movie recording, [Digital Lens Optimizer] will not appear. (Correction is
z
not possible.)
Enabling [Digital Lens Optimizer] corrects both chromatic aberration and
z
diffraction, although these options are not displayed.
Digital Lens Optimizer is applied automatically in Basic Zone modes when
z
correction data is registered on the camera.
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