Nikon D700 - Manual (Page 351)

325
U
f7: Assign AE-L/AF-L Button
Choose the role played by the AE-L/AF-L
button, either by itself (AE-L/AF-L button
press) or when used in combination with the
command dials (AE-L/AF-L+command
dials). The options available for AE-L/AF-L
button press are the same as for FUNC.
button press (pg. 320), except that AE-L/AF-L button press
defaults to AE/AF lock and has an additional B option (if this
option is selected, pressing the AE-L/AF-L button has the same effect
as pressing the B button to initiate autofocus). The options
available for AE-L/AF-L+command dials are the same as for
FUNC. button+dials (pg. 323), except that AE-L/AF-L
+command dials defaults to None and lacks 1 step spd/aperture
option.
A The Shooting Information Display
The role of the AE-L/AF-L button can also be selected in the shooting
information display (pg. 15).