Filter
Top Products
FOCUSIN
G-continued
I nfrared Photography
The plane
of
sharpest focus for infrared
li
ght
is
slightly
more distant than its counterpart for visible
li
ght
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 counterclockwi
se
until the point focused
is
aligned with the
red
dot (or
lin
e)
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 l
ess
are used stopped down to f/8 or below, no adjustment
is
necessary due to the large depth
of
field available.
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
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
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)