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-EXPOSURE-continued---------------
Depth of Field
When you shoot at a certain aperture and focusing distance
,
you will find that not only the main subject but objects in a
cer-
tain distance range in front of and behind
it
will be
sharp
in the
final photograph
.
Objects beyond
this
range become
increas-
ingly out of focus
.
This "in-focus zone" is known
as
depth of
field
.
When
this
zone of sharpness is
large,
the depth of field is
said to be deep; when it is small,
the
depth of field is said to
be
shallow.
The following is
true
of depth of
field
:
1) The smaller
the
shooting aperture
(i.e.
the larger the numeri-
cal
f-number),
the
deeper
the depth of field
;
the larger the
aperture,
the shallower the depth of field
.
2) The farther away
the
subject is from the
lens,
the deeper
the'
depth of field becomes
;
the
closer to the
lens,
the shallower
the
depth
of field
.
36
3)
The longer
the
focal length
of a
lens, the
shallower the
depth
of field at each
f/stop
;
the shorter the focal
length
,
the
deeper
the depth of field
.
4)
There
is greater
depth
of field behind the
main
subject than
in front of
it.
The depth of
field
at each aperture is
indicated
on the
lens
by a
set of color-coded
lines
®
(corresponding
to the
colors of
the
f-numbers on
the
aperture
ring)
which are used in conjunction
with the
distance
scale
@
.
The
range is indicated
by
the
dis-
tance between the lines.
Note:
Certain Zoom-Nikkor and special-purpose Nikkor
lenses
do not
have
a
depth-of-field
scale.
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