Nikon Nikkormar FT3 Руководство по эксплуатации - Страница 18
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FOCUSING
Focusing is always done at full aperture with Nikkor
lenses. This gives the brigh test possible image on the
focusing screen for easy viewing
and
composing. It
also minimizes depth of field so the image snaps in
and out of focus distinctly.
The Nikkormat FT3 focusing screen consists of
a
matte Fresnel field with
a centra
l
3mm¢
sp
lit-image
range finder
spot surrounded
by
a doughnut-shaped
1 mm-wide microprism for rapid
,
accurate
focusing.
Look through the viewfinder
and
turn the focusing
ring until the two halves
of
the
central
rangefinder
image
coincide
to form
a single, sharp
image,
or
until
the image in the microprism
appears sharp and crisp.
This focusing
screen
is
suitable for subjects
with both
straight
lines
and
ill-defined
contours.
However, when
used with len
ses
having
a
maximum
aperture smaller
than
f/4.5, or
in
close-up
photography, the range finder
spot
is likely
to
darken. In this
case, focus on
the
surrounding
matte
field.
The lens
can also
be pre focused using the distance
scale
engraved in
both
feet
and
meters
on
the lens
barrel. Line up the black indicator line
on
top
of
the
milled ring
opposite
the camera-to-subject distance
as
measured
or estimated.
Thi
s
technique is useful
for
candid shots of elusive subjects
when time does not
permit through-the-lens
focusing.
18
Microprism/split-image screen