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23
Aperture
set at
f/1.4
objects
in
the
back-
ground
appear
blurred
and
out of focus.
Aperture
set at
f/16
objects
in
the back-
ground
appear sharply
focused.
By depth
of
field, it is meant the range
over
which objects
in the foreground and background
appear acceptably sharp
when the camera lens
is focused
on
a subject
at
a
given
destance.
The depth
of
field
becomes
more
extensive when
the lens aperture is closed to a
smaller opening
and I ikewise increases in proportion
to
the
camera-
to-subject
distance.
The depth of field
can
be determined by referring
to the table on the following page
or
by directly
reading
off
the depth -of-field
scale engraved on
the lens barrel.
I n case the
camera
lens is focused
on a
subject at
a
distance
of
two meters and the
correct aperture
setting
is
f/16,
the range indicated by the figure
"16"
on both
side of
the index
(1)
is the depth
of
field.
I
n other
words, all objects within the
range
of
about
1.3 meters to 4 meters will
appear
acceptably sharp on
the film
plane.
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