Canon EOS 70DN - Adjusting the LCD Monitor Brightness; Changing Image Playback Settings

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You can adjust the brightness of the LCD monitor to make it easier to
read.
1
Select [LCD brightness].
Under the [52] tab, select [LCD
brightness], then press <0>.
2
Adjust the brightness.
While referring to the gray chart,
press the <U> key, then press
<0>.
Changing Image Playback Settings
3 Adjusting the LCD Monitor Brightness
To check the image’s exposure, looking at the histogram is recommended
(p.295).