Nikon D800 User Manual (en)

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Shutter-Speed and Aperture Lock
Shutter speed lock is available in shutter-priority auto and manual 
exposure modes, aperture lock in aperture-priority auto and 
manual exposure modes.  Shutter speed and aperture lock are not 
available in programmed auto exposure mode.
1
Assign shutter speed and aperture lock to a camera 
control.
Select Shutter spd & aperture lock as the “button + 
command dials” option in the Custom Settings menu (
Shutter speed and aperture lock can be assigned to the Fn 
button (Custom Setting f4, Assign Fn button
0 311), the 
depth-of-field preview button (Custom Setting f5, Assign 
preview button
0 315), or the A AE-L/AF-L button (Custom 
Setting f6, Assign AE-L/AF-L button
2
Lock shutter speed and/or aperture.
Shutter speed (exposure modes f and h)
: Press the selected button 
and rotate the main command dial until 
F icons appear in the 
viewfinder and control panel. 
To unlock shutter speed, press the button and rotate the main 
command dial until the 
F icons disappear from the displays.
Fn
 button
Main command dial