Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 86)

Vertical Shooting
Buttons, dial, and a Multi-controller for vertical shooting are arranged near the bottom of the
camera (
).
When using the controls for vertical shooting, set the vertical-grip On/Off switch to
<
>.
When you are not using these controls, set to < > to prevent unintended
operations.
Note
Vertical-grip Multi-function button 2 and the vertical-grip depth-of-field preview
button (
) can also be used with the vertical-grip On/Off switch set to < >.
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