Nikon F25B Bedienungsanleitung Seite 19

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Seitenansicht 18
DEPTH OF
FIELD
Depth
of
field refers
to
the
zone
of
acceptable
focus ex-
tending
in
front
of,
and
behind,
the
plane
of
sharpest
focus. Within this zone, image
blur
is
negligible
and
everything
may
be considered as being
in
sharp focus.
Three
factors
greatly influence
the
depth
of
field :
the
focal length
of
the
lens
in
use,
the
camer
a-to-subject
distance,
and
the
taking
aperture.
The
smaller
the
aper-
ture
and
the
shorter
the
focal length
of
the lens,
the
greater
the
depth
of
field. Also,
the
closer
the
subject,
the
shallower
the
depth
of
field.
These
three
factors
can
operate
independently
or
in
conjunction
with
one
an-
other,
with
anyone
factor
capable
of
partially cancel ing
the
effects
of
the
other.
Thus, by careful selection and
use,
the
photographer
can exercise wide creative
control
over
the
final picture.
Depth-of-Field Preview Button
As
most
Nikkor lenses
are
operated
at
full
aperture
for
ease
of
focusing, visualization
of
the
depth
of
field
at
the
shooting
aperture
may be difficult.
Thus,
the
camera's
depth-of-field preview
button
often
can
come
in
handy.
The
depth-of
-field preview
button
lets
you
check (or
"preview")
the
zone
of
sharpness
at
any
time
before
(or
after) shooting. Simply
by
depressing
the
button,
the
lens
is
stopped
down
to
the
preselected
aperture
to
allow
you
to
see
how
much
background
and
foreground
is
in
or
out
of
focus.
19
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