Nikon D4S - Manual (Page 148)

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Lens Types
When using a CPU lens equipped with an aperture ring ( 0 403), lock
the aperture ring at the minimum aperture (highest f-number). Type G
and E lenses are not equipped with an aperture ring.
When using non-CPU lenses ( 0 235), select exposure mode g
(aperture-priority auto) or h (manual). In other modes, exposure mode
g is automatically selected when a non-CPU lens is attached (0 405).
The exposure mode indicator (e or f ) will flash in the top control panel
and g will be displayed in the viewfinder.
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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.
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Custom Setting e5—Modeling Flash
This setting controls whether optional flash units that support the
Nikon Creative Lighting System (CLS;
0 198) will emit a modeling flash
when the Pv button is pressed. See page 333 for more information.
Pv button