Nikon D4 User Manual - Page 159
Shutter-Speed and Aperture Lock
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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 "Press + command dials" option in the Custom Settings menu (0 332). Shutter speed and aperture lock can be assigned to the Fn button (Custom Setting f3, Assign Fn button, 0 328), the Pv button (Custom Setting f4, Assign preview button, 0 333), or the center of the sub-selector (Custom Setting f6, Assign subselector center, 0 333). 2 Lock shutter speed and/or aperture. Shutter speed (exposure modes f and h): Press the selected control and rotate the main command dial until F icons appear in the viewfinder and top control panel. Z Fn button Main command dial To unlock shutter speed, press the control and rotate the main command dial until the F icons disappear from the displays. 133