Nikon D3X a9: AF-ONButton, Option, (Hold), AE lock, AE lock, release), (Reset on, Description, B AE/AF lock

a9: AF-ON Button

Choose the function performed when the

Bbutton is pressed.

Option	Description
A B	Pressing the Bbutton initiates autofocus.
(default)
B AE/AF lock	Focus and exposure lock while the Bbutton is
	pressed.

CAE lock only Exposure locks while the Bbutton is pressed.

	AE lock	Exposure locks when the Bbutton is pressed, and
		remains locked until the button is pressed a second
D	(Reset on
		time, the shutter is released, or the exposure meters
	release)
		turn off.
	AE lock	Exposure locks when the Bbutton is pressed, and
E		remains locked until the button is pressed a second
	(Hold)
		time or the exposure meters turn off.

FAF lock only Focus locks while the Bbutton is pressed.

U

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