Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 67)

Using the Viewfinder
Look through the viewfinder to activate it. You can also restrict display to either the screen or
viewfinder (
).
Adjusting the Viewfinder
1.
Turn the dioptric adjustment knob.
Turn the knob left or right to make the viewfinder display look sharp.
Caution
The viewfinder and screen cannot be activated at the same time.
At some aspect ratios, black bars are displayed on the top and bottom or left and
right edges of the screen. These areas are not recorded.
67