Fe Lock K K; Set Iso Speed (Hold Button, Turn ); Set Iso Speed ( During Metering); Shutter Speed Setting In M Mode - Canon EOS 5D Mark III Instruction Manual

: 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 (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.
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.
: 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. 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.

: Shutter speed setting in M mode

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

: Aperture setting in M mode

In manual exposure <a>, you can set the aperture with the <6> or
<5> dial.
during metering)
82: Custom Controls
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