Nikon d3s User Manual (en)

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g: Aperture-Priority Auto
In aperture-priority auto, you choose the aperture while the camera 
automatically selects the shutter speed that will produce the 
optimal exposure. To take photographs in aperture-priority auto:
1
Select exposure 
mode 
g.
Press the 
I button 
and rotate the main 
command dial until g is 
displayed in the 
viewfinder and top 
control panel.
2
Choose an aperture.
Rotate the sub-
command dial while the 
exposure meters are on 
to choose an aperture 
from values between 
the minimum and 
maximum for the lens. Small apertures (high f-numbers) 
increase depth of field (see page 119), bringing both 
foreground and background into focus. Large apertures (low 
f-numbers) soften background details in portraits or other 
compositions that emphasize the main subject.
Aperture can be locked at the selected setting (
0 131).
Small aperture (f/36)
Large aperture (f/2.8)
I button
Main command dial
SHOOT 
CUSTOM 
Sub-command dial