Canon PowerShot G7 X Mark III, Advanced User'S Manual, Page: 283 / 329

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When C.Fn-2 or C.Fn-3 is set to [1:Reverse direction], changing the
direction of rotation only applies to shutter speed, aperture value, or
Program Shift adjustment, as assigned to the ring or dial.
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To restore [Custom Functions(C.Fn)] defaults (except [Custom Controls]
settings), choose
[Reset camera] → [Other settings] → [Custom
Function(C.Fn)] → [OK].
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Customizing Buttons
Customize functions of buttons, such as the shutter button.
(AE lock) button, ring, and dial settings apply to / / / / /
modes.
[ Shutter butt. half-press] and [ Movie shooting button] settings apply
to / / / / modes.
1
[C.Fn II:Others Custom Controls]
2
Choose a button.
3
Choose a function.
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