Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 229)

Manual Exposure Compensation
Exposure compensation can brighten (increased exposure) or darken (decreased exposure)
the standard exposure set by the camera.
For details on exposure compensation when <
> mode and ISO Auto are both set, see
M: Manual Exposure .
1.
Check the exposure.
Press the shutter button halfway ( ) and check the exposure level
indicator.
2.
Set the compensation amount.
Increased exposure, to brighten images
Decreased exposure, to darken images
Turn the < > dial while looking at the viewfinder or top LCD panel.
If the setting cannot be set, move the power switch to < >, then
turn the < > dial.
The exposure compensation range is ±5 stops in viewfinder shooting
and ±3 stops in Live View shooting.
The exposure compensation range shown in the viewfinder and on the
top LCD panel is up to ±3 stops. To specify more than ±3 stops,
configure the corresponding
Quick Control setting.
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