Canon EOS R5C Manual page 427

• Diffraction correction (
The diffraction by the lens aperture degrading the image sharpness can be
corrected. If [Enable] is set, the corrected image will be displayed. If the effect is
difficult to discern, magnify the image (
Caution
Processing RAW images in the camera will not produce exactly the same results
as processing RAW images with Digital Photo Professional (EOS software).
If you perform [Brightness adjustment], noise, banding, etc. may be intensified
with the effects of adjustment.
When [Digital Lens Optimizer] is set, noise may be intensified together with the
effects of correction.
When [Digital Lens Optimizer] is set, image edges may be emphasized, under
some shooting conditions. Adjust sharpness of the Picture Style as needed.
Processing with [Digital Lens Optimizer] set to [High] may take some time.
Note
Effects of lens aberration correction vary by lens and by shooting conditions. Also,
the effect may be difficult to discern depending on the lens used, shooting
conditions, etc.
)
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