Nikon D3S User Manual page 145

A
Depth-of-Field Preview
To preview the effects of aperture, press and
hold the Pv button. The lens will be stopped
down to the aperture value selected by the
camera (modes e and f ) or the value chosen by
the user (modes g and h), allowing depth of
field to be previewed in the viewfinder.
A
Custom Setting e3—Modeling Flash
This setting controls whether optional flash units that support the
Nikon Creative Lighting System (CLS; see page 187) will emit a modeling
flash when the Pv button is pressed. See page 312 for more information.
Pv button
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Z