Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 244)

h Auto Exposure Bracketing (AEB)
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During AEB shooting, the < A > icon in the viewfinder and the < h > icon
on the top LCD panel will blink.
If the drive mode is set to < u > or < 6 >, press the shutter button three
times for each shot. When < o >, < p >, < 6o >, or < 6p > is set
and you hold down the shutter button completely, the three bracketed
shots will be taken continuously and the camera will automatically stop
shooting. When <
k > or < l > is set, the three bracketed shots will be
taken continuously after an approx. 10-sec. or 2-sec. delay.
You can set AEB in combination with exposure compensation.
If the AEB range exceeds ±3 stops, the end of the exposure level
indicator will display <
J / > or < I / >.
AEB cannot be used with bulb exposures or flash.
AEB will be canceled automatically when you set the power switch to
<
2 > or when the flash is fully charged.