Pentax LX LX Manual - Page 34

approximate

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DEPTH OF FIELD SCALES 5 f:4 f :5.6 1 0 Distance (m) Depth of field is the area in acceptable sharpness in front of and behind the subject in focus at a particular f/stop setting. Depth of field can be checked visibly by activating the depth-of-field preview while looking through the camera viewfinder. If more precise information is required, however, the depth of field scales engraved on most camera lenses provide a convenient means of determining the approximate distances. The numbers engraved on either side of the depth of field scale represent f/stops. To read the scale, look at the distance scale of the lens opposite the index marks on the depth of field scale representing the f/stop set on the aperture ring. For example, in the photograph the lens is focused on a subject 5 meters away. At f/4 the depth of field is from approximately 4 to 7 meters. At f/5.6, the depth would be increased from approximately 3.6 meters to 7.9 meters. • 32

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DEPTH
OF
FIELD
SCALES
f:4
5
f
:5.6
1
0
Distance
(m)
Depth
of
field
is
the
area
in
acceptable
sharpness
in
front
of
and
behind
the
subject
in
focus
at
a
particular
f/stop
setting.
Depth
of
field
can
be
checked
visibly
by
activating
the
depth
-of
-field
preview
while
looking
through
the
camera
viewfinder.
If
more
precise
information
is
required,
however,
the
depth
of
field
scales
engraved
on
most
camera
lenses
pro-
vide
a
convenient
means
of
determining
the
approximate
distances.
The
numbers
engraved
on
either
side
of
the
depth
of
field
scale
represent
f/stops.
To
read
the
scale,
look
at
the
distance
scale
of
the
lens
opposite
the
index
marks
on
the
depth
of
field
scale
representing
the
f/stop
set
on
the
aperture
ring.
For
example,
in
the
photograph
the
lens
is
focused
on
a
subject
5
meters
away.
At
f/4
the
depth
of
field
is
from
approximately
4
to
7
meters.
At
f/5.6,
the
depth
would
be
increased
from
approxi-
mately
3.6
meters
to
7.9
meters.
•
32