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DEPTH OF FIELD
Depth
of
field refers to the
zone of acceptable focus ex-
tending in front
of, and
behind,
the
plane
of sharpest
focus.
Within this
zone,
image blur is negligible
and
everything
may be
considered as
being
in sharp focus.
Three
factors greatly
influence
the
depth
of field: the
focal
length
of
the
lens in use,
the camera-to-subject
distance, and the taking aperture.
The
smaller the aper-
ture and
the
shorter
the focal length
of the
lens,
the
greater
the depth
of field.
Also,
the
closer
the subject,
the shallower the
depth
of field.
These three
factors can
operate
independently or in
conjunction with one
an-
other, with anyone factor capable of
partially
canceling
the effects of
the
other.
Thus,
by
careful selection and
use, the photographer can
exercise
wide
creative
control
over
the final picture.
Depth-of-Field Preview Button
As
most Nikkor lenses
are operated at full aperture
for
ease of focusing,
visualization
of the
depth
of field at
the
shooting aperture
may be difficult. Thus, the
camera's
depth-of-field preview button
often can come
in handy
.
The
depth-of-field
preview bu tton lets
you check (or
"preview")
the
zone of sharpness at any time before (or
after) shooting.
Simply by depressing the button, the
lens is
stopped down to
the preselected
aperture to allow
you
to see how much background
and
foreground is in
or out of
focus.
19
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