Nikon F4 Body Only Film Camera User Manual


 
DEPTH-OF
-
FIELD
PREVIEW
BUTTON
II
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When a lens with an automatic diaphragm
is
used, the view-
finder image
is
viewed with the lens
at
maximum aperture. By
depressing the depth-of-field preview button, you stop the lens
down to the aperture
set,
enabling you
to
examine depth of
field before shooting. The viewfinder image normally darkens
as
the aperture gets smaller. Portions of the picture that appear
in
focus when the button
is
pressed are in the zone of sharpest
focus.
e
Depth
of field can only be previewed in the Aperture-Priority
Auto
(A)
or Manual
(M)
exposure modes.
e During preview, autofocus and Electronic Rangefinder opera-
tion are not possible.
e During preview with lenses with meter coupler, attaining
correct exposure
is
not possible, because exposure must be
determined by full-aperture metering.
69