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

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B
: Setting the White BalanceN
196
4
Press the <n> button 
(9)
5
Select the custom white balance.
 
Look at the LCD panel and turn the 
<5> dial to select <
O
>.
 
If the exposure obtained in step 1 differs greatly from the standard 
exposure, a correct white balance may not be obtained.
 
In step 3, the following images cannot be selected: Images captured with 
the Picture Style set to [Monochrome], multiple-exposure images, 
frame-grab images from 4K movies, and images shot with another 
camera.
 
Instead of a white object, shooting a gray chart or standard 18% gray 
reflector (commercially-available) can produce a more accurate white 
balance.
 
The personal white balance registered with the EOS software will be 
registered under <O>. If you perform step 3, the data for the registered 
personal white balance will be erased.