Canon 1D X - Manual (Page 341)

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85: Custom Controls
During flash photography, pressing the button assigned to this function
will fire a preflash and record the required flash output (FE lock).
You can press <0> to change the ISO speed. Set while looking at the
top LCD panel, viewfinder, or LCD monitor.
You can set the ISO speed by holding down <0> and turning the
<6> dial. If Auto ISO is set, manual ISO speed setting will take effect.
Auto ISO cannot be set. If you use this function in the <a> mode, you
can adjust the exposure with the ISO speed while maintaining the
current shutter speed and aperture.
During metering, you can set the ISO speed by turning the <5> dial.
If Auto ISO is set, manual ISO speed setting will take effect. Auto ISO
cannot be set. If you use this function in the <a> mode, you can adjust
the exposure with the ISO speed while maintaining the current shutter
speed and aperture.
During metering, you can set the ISO speed by turning the <5> dial.
The functions of the <O> and <i> buttons will be switched between
them. By pressing the <i> button and turning the <6> dial, you
can set the exposure compensation or aperture.
: FE lock
: Set ISO speed
: Set ISO speed (hold button, turn )
: Set ISO speed ( during metering)
: Set ISO speed, O z g ( during metering)
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