Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 315)

Setting MF Peaking (Outline Emphasis)
Edges of subjects in focus can be displayed in color to make focusing easier. You can set
the outline color and adjust the sensitivity (level) of edge detection.
1.
Select [ : MF peaking settings].
2.
Select [Peaking].
Select [ On ].
3.
Set [Level] and [Color].
Set as necessary.
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