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UTILIZING THE LENS DEPTH OF FIELD
1.
What is meant by Depth of Field
Ta
check
the
eff
ec ts
of the
aperture you
have
selcctcd
-
how wei
l
you have
blurred out
th
e
background or
h
ow
w ide
t11e
depth of sharpness is
·
ali
y
ou
have
ta do
is to
look through
the
viewfinder.
becausc
th
e
aper
ture
w
ill
close
dawn
ta the
size
you
have
selec
ted as
yo
u
press
dawn
the Depth
of
F ield
Prev1ew
Bu
t
to
n.
T
hu
s, the
sharpness of
a
picture
~
t~nds
over
a
co
nsid
erable range
bath
in
front of
.1nd
bel1ind
the
po
int
th
e
lens
is
focused
on.
This
?one
o
f
sharpn
ess
is referred
to
as
th
e
depth of field.
Tl1e widt
h of
th
e
d
ep
th
o
f
field
differs
depending
on
th
e
lens
focal
length, subjec
t distance.
and
lens
aperture.
!-
The
higher
the aperture
number
(th
e
smaller
the
apert
ure).
tl1e
wid
er
th
e
depth of
field
.
The lower
the
aper ture
number
,
the
narrower
it
becomes.
1
1-
T
he
longer
tl1e
focal
length
of
the
lens,
th
e
narrower
th
e
depth of
field,
and
the
shorter
it is
A
the
wider
it
becomes.
®
The farther
the
distance
the lens
is focused
on,
the wider
the d epth of
fi
eld.
<!J
The zone
of sharpness
i
n
front of
the poin
t
of
sharpes
t focus
is
narrower th an
the zone of
sharp
ness
beh
i
nd
the same
point.
@
Example A
shows
the
aperture
fully
open.
Example B
shows
the
aperture stopped
down
to
f/16.
2.
How to see the Depth of Field
Ali the
interchangeable
lenses
of the
FUJI CA ST705
are provided with a
depth of
field
indicator
on
the
len
s barrel. For
ex ample, if you are
using an F
1.8
55mm
normal
lens and
have
set the aperture at
f/8
and
the
distance
at
15 feet
(5ml, everything from
about
11 .5
fee
t l3.5ml
to 28.5
feet (8.7m) will
be in
sharp
locus.
B
59
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Table des Matières
