Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 325)

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You can change the settings of the ISO speed, sound-recording level,
etc. while suppressing the operation sound during movie shooting.
When [ z 5: Silent Control ] is set to
[ Enable h ], you can use the touch pad
< h > on the inner ring of the Quick
Control Dial.
You can just touch on the top, bottom,
left, or right of <
h > for silent operation.
During movie shooting, you can press
the <
Q > button to enable the Quick
Control operation and change the
functions below with <
h >.
*1: With ISO Auto set.
*2: With [
Sound recording: Manual/Line
input ] set.
3
Silent Control
Settable
Functions
Shooting Mode
d / bulb s f a
Shutter speed – k – k
Aperture – – k k
Exposure k k k k * 1
ISO speed – – – k
Recording
level*
2
k k k k
n Volume k k k k
If [ z 5: Silent Control ] is set to [ Enable h ], you cannot perform Quick
Control setting with the < 5 > Quick Control Dial or < 6 > Main Dial
during movie shooting.
Even if you change the aperture silently with < h >, the movie will still
record the lens aperture-driving sound.
If there is water or dirt on the < h >, the touchscreen operation may not
work. In such a case, use a clean cloth to clean the < h >. If it still does
not work, wait a while and operate it again.
Before shooting a movie, you can use < h > with the [ Rec. level ] setting to
adjust the sound-recording level.