Nikon D5 - Manual (Page 25)

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• q AF-area mode + AF-ON: As for AF-area mode, above, ex-
cept that pressing the control also initiates autofocus.
• B AE/AF lock: Focus and exposure lock while the control is
pressed.
• F AF lock only: Focus locks while the control is pressed.
• A AF-ON: Pressing the control initiates autofocus.