Canon EOS-1D X Mark III Af Setting Manualbook page 122

[Automatic Update of Registered
Settings] in [Custom shooting mode
(C1-C3)]
When [Automatic Update of Registered Settings] is set to
[Enable], the settings changed during shooting in [C1]-[C3]
modes can be automatically reflected in the registered settings.
Change settings while
shooting with [C1]
Next time [C1] is called, it will
be the changed setting
In [Custom shooting
mode (C1-C3)] when
[Automatic Update of
Registered Settings] is set
to [Enable], the registered
settings are automatically
updated to the settings
changed during shooting
in each of [C1] to [C3]
modes. Automatic update
is recommended if the
settings you have changed
are the settings you want
to use next.
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