Shutter-Speed And Aperture Lock - Nikon D3S User Manual

Shutter-Speed and Aperture Lock

The F button can be used to lock shutter speed at the value
selected in shutter-priority auto or manual exposure mode, or to
lock aperture at the value selected in aperture-priority auto and
manual exposure modes. Lock is not available in programmed
auto.
Shutter-Speed Lock
To lock shutter speed at the selected value, press the F button and
rotate the main command dial until F icons appear in the
viewfinder and the top control panel.
F button Main command dial
Z
To unlock shutter speed, press the F button
and rotate the main command dial until the
F icons disappear from the displays.
SHOOT
CUSTOM
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