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Depth-of-field preview button ®
When a lens with
an
automatic diaphragm
is
used, the image
in
the viewfinder
is
viewed with the lens at ma
xi
mum aperture.
However, by depressing the depth-of-fie
ld
preview button,
the lens will
be
stopped down to the aperture set, enabling you
to examine depth of field before shooting. The image
in
the view-
finder darkens according to the selected f-number: the smaller
the aperture (i.e
.,
the larger f-number), the darker the image.
Components of the picture that appear
in
focus when the button
is
depressed wi
ll
be
in
the zone of sharp focus.
Note that the button should
be
depressed all the way.
Note:
When
shooting in the automatic exposure mode with an AI lens,
do not release the shutter while depressing the preview button; improper
exposure may result.
To
illustrate depth of field, the following photos were taken with
the
AF
-Nikkor
BOmm
f/2
.B
lens at a focused distance of
5m
; the
only difference
is
that they were shot at various apertures. Con-
trol of depth of field enables you to create photos having selec-
tive focus (where the major subject stands out from the back-
ground and/or foreground) or overall sharpness (in which all
elements
in
the picture appear sharp). Depth of field imparts to
your picture a character
all
its own.
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