During Metering); Fe Lock K K; Set Iso Speed; Set Iso Speed (Hold Button, Turn ) - Canon EOS-1DX Instruction Manual

85: Custom Controls
: FE lock
During flash photography, pressing the button assigned to this function
will fire a preflash and record the required flash output (FE lock).

: Set ISO speed

You can press <0> to change the ISO speed. Set while looking at the
top LCD panel, viewfinder, or LCD monitor.
: Set ISO speed (hold button, turn
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.
The setting cannot be reverted to Auto ISO. 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.
: Set ISO speed (
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. The setting
cannot be reverted to Auto ISO. 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.
: Set ISO speed, O z g (
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.

: Shutter speed setting in M mode

In manual exposure <a>, you can set the shutter speed with the
<6> or <5> dial.
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