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Depth of Field
The
area between
the nearest
and
farthest
points of
the
image
fi eld
that
is
in
f
ocus w
hen
you
take
the
picture
is
ref
erred
to
as
th
e
"depth
of field."
The
depth
of
field
is shallow w
hen
w ide lens
apertures
are
used
(f/
l
.7
,
f/2
et c.) and
becomes progressively
greater
at sma
ll
apertures
(f/S, f
/
16,
etc.)
.
Thus, if
you
wish to
highlight
your subject aga
in
st an
out-of -focus
background
and
foreg
round, for
examp le,
you shou
ld
use a
w ide lens
aperture;
co nverse
ly,
for max imum
fo
cus
over
the
entire
field, you should use as
sma
ll
an aperture
as exposu re cond
iti ons
perm
it.
Depth
of f
ield is also
great er
w
ith
the shorter foca
l
length
(w
id
e-ang
le)
lenses
and becomes progress ively
shall
ow w
ith
t he
longer
standard and telephoto foca
l
lengt
h
lenses
.
The
depth
of
field
is
indicated by
th
e
depth-of-fie ld
sca le
bes ide
the d
istan
ce
scale
of th
e
I
.
ens.
With the
50
mm
f
/
l
.7
standard lens focused at
3 meters
and th
e
apertu
re
sca
le
set
at
f/ 16,
for
ex
ample, th
e
depth of
fi
eld
(i.e.
area
betw een th
e
"
16" on
both
ends
)
runs from
1.5
to
infinity
.
78
-
- -
1,
~
a
6
2
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5
2
l1f
m:
8
1
~
1
1'418
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I)
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