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 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 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 and buttons will be switched between
them. By pressing the 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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