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Nikon Nikkormar FT3 - Depth of Field; Depth-Of-Field Preview Bu Tton

Nikon Nikkormar FT3
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DEPTH
OF
FI
ELD
Depth
of
field refers
to
a
zone
extending
in
front
of
and
behind
the
plane
of
sharpest focus. Within this
zone
blur
(or unsharpness
of
the
image) will be
negligible
and
everything
can be
accepted
as in sharp -
focus.
Depth
of
field
extends
a greater
distance
behind
the
subject in focus
than
in
front.
Depth
of
field
depends
on
three
factors: focal length
of
the
lens,
lens-to-subject distance
and
taking
aperture.
The
smalier
the
aperture
and
the
shorter
the
focal length
of
the
lens,
the
greater
the
depth
of
field
(for
example,
wide angle lenses have
more
depth
of
field
than
tele-
photos).
Also, the closer
the
subject,
the
smalier
the
depth
of
field. These
three
factors
can
be
adjusted
independently
or
in
combination
to
give
the
photo-
grapher creative
control
over
the
final
picture.
Depth-ot-Field Preview Button
The
depth-of-field preview
button
located
on
top
of
the
Nikkormat
lets
you
check
depth
of
field
before
shooting
and
make desired
adjustments.
Press
the
button
and
the
lens
stops
down
to
the
preselected
aperture
to
aliow
you
to
see
how
much
background
or
foreground
is in
or
out
of
focus.
21

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