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Depth
Of
Field
When
you
shoot at a certain aperture and
focusing
distance,
you
will
find
that
not
only the
main
subject
but
also objects within a certain range in front
and
behind
it will
be sharp
in
the
final
photograph.
This
"in-focus
zone"
is known
as depth of
field.
Objects
beyond
this range become increasingly
out
of focus.
Because the Nikonos-V
features
aperture-priority
automatic exposure,
you
can control
depth of
field
by
varying the
f/stop. When
the zone of sharpness is
large, depth
of field
is
"deep";when
it is
small, depth
of
field
is
"shallow."
For any individual lens:
oThe
smaller the aperture
(the
larger the f-number),
the deeper the depth of
field;the larger
the aperture
(the
smaller
the f-number),
the shallower the depth
of
field.
o
Depth of
f ield
becomes deeper the farther the
sub-
ject
is
from
the lens; the
depth of field becomes
shallower
the closer the subject
is
to the
lens.
.
Depth of
f ield
behind
the main
subject
is
deeper
than
in
f ront
of
it.
Between
lenses
of different
focal lengths: longer
focal length lenses
have
shallower depth of
field
at
each f/stop; shorter
focal length lenses have
deeper
depth of
field
at each
f/stop.
As
you
open and close the aperture, the
pincer-type
depth-of-field
indicators
open
and close to show
the
distance
range
which will be
in focus in the final
photograph.
(ln
tne case of the LW-Nikkor, depth of
field
is indicated
by
pairs
of colored depth-of-field
index lines on the aperture scale.)
For
example,
with the
standard
W-Nikkor 35mm
f/2.5
lens, when the lens focusing knob
is
set at 3m
and
the
lens
aperture
knob
at
f/16, the
indicators
show
that all objects between
1.5m
and
infinity
(oo)will
be
in
focus
in the final
photograph.
oTo
minimize
any errors
you
may have made when
measuring
or estimating
the
subiect distance
or focusing, use
the
sma//esl
aperture
(the
largest f-numbeil
possible.
Alten
nately, move farther from the
subject
or use a
lens with
shorter
focal length.
4
s
45
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