Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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The LCD monitor’s brightness is adjusted automatically for optimum 
viewing. You can set the automatic adjustment’s brightness level 
(brighter or darker) or adjust the brightness manually.
1
Select [LCD brightness].
 
Under the [52] tab, select [LCD 
brightness
], then press <
0>.
2
Select [Auto] or [Manual].
 
Turn the <6> dial to make the 
selection.
3
Adjust the brightness.
 
While referring to the gray chart, turn 
the <5> dial, then press <
0>.
 
You can adjust [Auto] to one of three 
levels, and [Manual] to one of seven 
levels.
Changing Image Playback Settings
3
 Adjusting the LCD Monitor Brightness
Automatic adjustment
Manual adjustment
While [Auto] is set, be careful not to obstruct the round, external light sensor 
(p.20) on the right of the LCD monitor with your finger, etc.
To check the image’s exposure, looking at the histogram is recommended 
(p.248).