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FOCUSING-continued
Infrared Photography
The plane
of
sharpest focus
for
infrared I ight is
sl
ightly
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
sharply through
the
viewfinder. Then, turn
the fo-
cusing
ring
counterclockwise
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 offield available.
Note:
Some
new
optics
using N ikon's
Extra-low Dispersion
(ED) glass, as well as reflex (catadioptric)
lenses,
do not require
refocusing for
infrared
photography. Refer to
individu al lens
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.
The camera's film p lane 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.
E
E
(bayonet mount front surface
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