Canon EOS 5D Mark IV L-series Standard Zoom Lens Kit Owner's Manual

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You can display the electronic level on the LCD monitor and in the 
viewfinder to help you correct the camera tilt.
1
Press the <B> button.
 
Each time you press the <B> 
button, the screen display will 
change.
 
Display the electronic level.
 
If the electronic level does not 
appear, set [53: z button 
display options
] so that the 
electronic level can be displayed 
(p.86).
2
Check the camera’s tilt.
 
The horizontal and vertical tilts are 
displayed in 1° increments.
 
When the red line turns green, it 
indicates that the tilt is almost 
corrected.
Q
 Displaying the Electronic Level
Displaying the Electronic Level on the LCD Monitor
Vertical level Horizontal level
 
Even when the tilt is corrected, there may be a margin of error of approx. ±1°.
 
If the camera is very tilted, the electronic level’s margin of error will be 
larger.
During Live View shooting and before movie shooting, you can also display 
the electronic level as described above (except with u+ Tracking).