Canon EOS R5 C User Manual page 319

Caution
Under difficult shooting conditions for AF (
displayed correctly.
Higher aperture values are more likely to prevent correct guide frame display.
No AF points are displayed while the guide frame is displayed.
The guide frame is not displayed in these situations.
• When the lens's focus mode switch is set to <
• When display is magnified
The guide frame is not displayed correctly during shifting or tilting of TS-E lenses.
Note
The camera's auto power off counter does not count time spent adjusting the focus
with a lens's electronic focusing ring.
Adjustment information not detected
), the guide frame may not be
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