Nikon d3s User Manual (en)

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❚❚Aperture Lock
To lock aperture at the selected value, press the 
F button and 
rotate the sub-command dial until 
F icons appear in the 
viewfinder and the top control panel.
To unlock aperture, press the 
F button and 
rotate the sub-command dial until the 
icons disappear from the displays.
Sub-command dial
F button
SHOOT 
CUSTOM