Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 66)

Basic Operation
66
During movie shooting, the touch pad provides a quiet way to adjust the
shutter speed, aperture, exposure compensation, ISO speed, sound-
recording level, and headphone volume (p.325).
This function works when [
z 5: Silent Control ] is set to [ Enable h ].
After pressing the < Q > button,
tap on the < 5 > dial’s inner ring
at the top, bottom, left, or right.
With [ 8 6: Multi function lock ] set
(p.439) and the power switch set to
<
R >, it prevents the Main Dial,
Quick Control Dial, and Multi-controller
from turning or tilting and changing a
setting inadvertently.
h Touch Pad
R Multi Function Lock Switch
If the power switch is set to < R > and you try to operate any of the
locked camera controls, < L > will appear in the viewfinder and on the top
LCD panel. Also, [ LOCK ] will appear on the Quick Control screen (p.67).
By default, with the power switch set to < R >, the < 5 > dial will be
locked.