NIKKORMAT FT2 - Page 20

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 a-+d
taking
aperture.
The
smaller
the
aperture
and
the
shorter
the
focal
length
of the
lens,
the
gre
ater
the
depth of
field
(for
example,
wideangle
lenses
have
more
depth of
field
than
tele-
photos).
Also,
the
closer
.the
subject,
the smaller
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-of-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 allow
you
to see
how much
background
or
foregound
is
in or
out of
focus.