Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 237)

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a : Manual Exposure
If the ISO speed is set to A (AUTO) for manual exposure shooting, you
can set exposure compensation (p.241) as follows:
• Under [ 8 6: Custom Controls ], with [ : Expo comp (hold btn,
turn ) ] (p.456).
• Quick Control (p.68)
While looking at the exposure level indicator (setting) on the bottom of
the viewfinder or on the top LCD panel, set the exposure compensation
amount.
Exposure Compensation with ISO Auto
If ISO Auto is set, the ISO speed setting will change to suit the shutter
speed and aperture in order to obtain the standard exposure. Therefore,
you may not obtain the desired exposure effect. In such a case, set the
exposure compensation.
If flash is used when ISO Auto is set, exposure compensation will not be
applied even if an exposure compensation amount is set.
Under [ z 2: Auto Lighting Optimizer ], if the checkmark < X > for
[ Disabled in M or B modes ] is removed, Auto Lighting Optimizer can be
set even in the < a > mode (p.189).
When ISO Auto is set, you can press the < A > button to lock the ISO
speed.
If you press the < A > button and recompose the shot, you can see the
exposure level difference on the exposure level indicator compared with
when the <
A > button was pressed.
If exposure compensation (p.241) was applied in < d >, < s >, or < f >
mode, and then the shooting mode is switched to < a > with ISO Auto
set, the exposure compensation amount already set will still be
maintained.
With ISO Auto set and [ 8 1: Exposure level increments ] set to [ 1/2-
stop, Exp. comp. 1/2-stop ], 1/2-stop exposure compensation will be
applied with the ISO speed (1/3 stop) and shutter speed. However, the
shutter speed displayed will not change.