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FOCUSIN G-continued
I nfrared Photography
The plane of sharpest
focus
for infrared
light
is
slightly
more distant than its counterpart
for
visible
light as seen
through the
camera's
viewfinder. Thus,
for sharpest
focus
in infrared photography,
adjustments
must be
made.
To
compensate for
this
shift
in
focus,
first
focus
the im-
age sharp
ly
through
the viewfinder. Then, turn the
fo-
cusing
ring
counterclockw ise
until the point
focused
is
aligned
with the red dot (or
line)
provided
on
the lens
barrel. For
example, in
the picture
below,
the lens
has
been
focused
for infinity (00) infrared
shooting.
Note
that when
lenses
having
a
focal
length of 50mm or less
are
used
stopped
down to
f/8 or
below, no
adjustment
is
necessary due
to the
large depth
of field avai lable.
Note
:
Some
new
optics using Nikon's Extra-low Dispersion
(ED) glass, as well
as
reflex (catadioptric)
lenses
,
do not require
refocusing for
infrared
photography. Refer to
individu
al
len
s
instruction manuals
for details.
18
Film-Plane Indicator
Under
various
precision
shooting situations, such as
close-up
photography,
it
is
often
necessary
to measure
the film-to-subject
distance to
ensure
the
sharpest
focus
.
Th
e
camera's film
plane is indicated
by
the
top edge of
the
figures
making up
the
serial
number
at the
upper
left
of
the camera body. Note
that these figures
are
46.5mm from the front surface of the camera's lens
mounting flange.
(mounting flange front
surface)
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