Canon EOS 5D Mark III with L-Series Zoom Lens Manuel Du Propriétaire

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Displaying the Grid and Electronic Level
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: 
button 
display options] so that the 
electronic level can be displayed 
(p.336).
2
Check the camera’s tilt.
 
The horizontal and vertical tilt are 
displayed in 1° increments.
 
When the red line turns green, it 
indicates that the tilt is corrected.
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 ±1°.
 
If the camera is very tilted, the electronic level’s margin of error will be bigger.
With this same procedure, you can display the electronic level during Live 
View shooting and before shooting a movie (p.200, 225). Note that the 
electronic level cannot be displayed during movie shooting. (The electronic 
level will disappear when you start shooting a movie.)