Nikon D750 User Manual page 120

A
Non-CPU Lenses (0 427)
Use the lens aperture ring to adjust
aperture. If the maximum aperture of
the lens has been specified using the
Non-CPU lens data item in setup menu
(0 235) when a non-CPU lens is
attached, the current f-number will be
displayed in the viewfinder and control
panel, rounded to the nearest full stop.
Otherwise the aperture displays will show only the number of stops
(F, with maximum aperture displayed as FA) and the f-number must
be read from the lens aperture ring.
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 P and S) or the value chosen
by the user (modes A and M), allowing depth
of field to be previewed in the viewfinder.
A
Custom Setting e5—Modeling Flash
This setting controls whether the built-in flash and optional flash units
that support the Nikon Creative Lighting System (CLS; 0 433) will emit
a modeling flash when the Pv button is pressed. See page 353 for more
information.
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Pv button