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FOCUSING SCALE
other objects
in the
picture area,
both in front
of
and
behind the
subject,
will
also
be in focus. Thi
s
is
"range
of sharpness" or "depth of field ."
To
permit instant reading
of the
depth
of
field
for any
lens
opening
and
distance,
a
DEPTH-OF-
FIELD
SCALE
composed of
number
s
corresponding
to
lens
openings
is
arranged
on either
side
of the
focusing
index.
FOCUSING INDEX
Suppose
you
hove set the aperture to
f
/8
and
the distance to about 9 feet; this
is
how
you
read
off
the depth
,
To
the left
of
the focusing
index
the line marked with the figure 8 feor·
responding to the lens opening) is opposite
6 feet.
To
the right
of
the index another line
marked with the figure 8 points to 16 feet. This
tells you that with
a
setting
of
about
9
feet
at
f
/
8 you have a depth-of-field zone extending
from about 6 to 16 feet
.
Within this
zone everything will be sharp
.
23
DEPTH-OF-FIELD SCALE
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