Canon 1D X - Manual (Page 171)

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In this mode, you set both the shutter speed and aperture as desired. To
determine the exposure, refer to the exposure level indicator in the
viewfinder or use a commercially-available exposure meter. This
method is called manual exposure.
* <a> stands for Manual.
1
Set the shooting mode to <a>.
Press the <W> button and turn
the <6> or <5> dial to select
<a>.
2
Set the shutter speed and
aperture.
To set the shutter speed, turn the
<6> dial.
To set the aperture, turn the <5>
dial.
You can also set the aperture by
pressing the <O> button, then
turning the <6> or <5> dial.
If you cannot set the shutter speed or
aperture, set the power switch to
<1>, then turn the <6> or <5>
dial.
3
Focus the subject.
Press the shutter button halfway.
X The exposure setting will be
displayed in the viewfinder and on the
top LCD panel.
On the right of the viewfinder, the
exposure level indicator < > indicates
the current exposure level relative to
the standard exposure index <a>.
a: Manual Exposure
Shutter speed
Aperture
COP
Y