Canon EOS Rebel T6s (no lens included) Owner's Manual

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Handy Features
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You can adjust the brightness of the LCD monitor to make it easier to 
read.
Under the [52] tab, select [LCD 
brightness
], then press <0>. Press the 
<Y> <Z> keys to adjust the brightness 
on the adjustment screen, then press 
<0>.
When checking the exposure of an 
image, set the LCD monitor brightness to 
4 and prevent the ambient light from 
affecting the image.
3
 Adjusting the LCD Monitor Brightness