Nikon d3s User Manual (en)

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Choose the number of focus points available for manual focus-
point selection.
Choose the function performed when the 
B button is pressed.
a8: AF Point Selection
G button
➜ A Custom Settings menu
Option
Description
51 points
Choose from the 51 focus points 
shown at right.
11 points
Choose from the 11 focus points 
shown at right. Use for quick focus-
point selection.
a9: AF-ON Button
G button
➜ A Custom Settings menu
Option
Description
AF-ON
Pressing the 
B button initiates autofocus.
AE/AF lock
Focus and exposure lock while the 
B button is 
pressed.
AE lock only
Exposure locks while the 
B button is pressed.
D
AE lock (Reset 
on release)
Exposure locks when the 
B button is pressed, and 
remains locked until the button is pressed a second 
time, the shutter is released, or the exposure meters 
turn off.