Minolta XG-7 - Page 39

Depth
of
field
The
distance
behind
and in
front
of the
focused
distance
within which
the image
ap-
pears
acceptable
sharp is called
the depth
of
f
ield.
It
extends
a
greater
distance
behind
the
foucsed
distance
than
in front
and is deter-
to
f/l6)
and becomes
greater
the farther from
the camera
the
lens
is
focused.
lt decreases as
the lens
is opened up
(e.9.
f/16
to
f/21
and the
closer
to the
camera the lens
is
focused. Depth
of field
is
greater
for
short
focal
length lenses
than for
telephoto's
at the same focused
dis-
mined
by
three factors:
the
aperture size,
the
tance
and
aperture. lt
is at its
least
for
any
distance
at which
the
lens
is focused,
and the
given
lens
in normal
mounting
when
the lens is
focal
length
of the lens
in
use. Depth
of
field
at
maximum
aperture
(as
when
metering
and
increases as
the
lens
is stopped down
(e.9.,
f/2
focusing
normally with Minolta
MD-
or
th of
sharp
f
ie
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