Ricoh GR III Operating Manual page 26

Press h in the shooting mode to activate the
assigned function. By default, [AF+AE Lock] is
assigned.
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24
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Using the Fn Button
Memo ---------------------------------------------------------------------------------------------------------
• The function of h can be changed in [Fn Button Setting] of the D2 menu. [ISO Button] (c),
[Drive Button] (d), and [Movie/Wireless Button] (k) can also be set in [Fn Button Setting].
(p.123)
• When the power is turned on or the mode dial is turned,
the current function of the button is displayed. If [Guide
Display] is set to [Off] in the E2 menu, the function is
not displayed.
AF+AE Lock
ISO Setting
Drive Mode
Still/Movie
2018/08/07 10:00:59