Canon EOS-1D X Mark III Af Setting Manualbook page 118

Selection
After registering the shooting settings using [Register] in
[Custom Shooting Mode (C1-C3)], you can recall the
registered settings by selecting [C1] from the shooting
mode. If you often take panning shots, you can register
the settings of a low-speed shutter shooting and select
[C1] when you want to take panning shots, making it
possible to smoothly switch to low-shutter speed. Next,
we will show you how to select [C1] more quickly.
Press the MODE button,
then from the shooting
mode:
Select [C1]
Switches to registered
camera settings
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