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Infrared Photography
Infrared film
may
be
used in
the Contax 139
for
specia
l
applications such as
night
photography
.
As
infrared
light
waves are
longer than
waves
of th
e
visible
light
spectrum,
however, the lens
wi
ll fo
cus at a
slightly
different point with
infrared
film,
even
though
the sub-
ject
w
ill
appear
t
o
be
in
focus inside
the viewf
ind er.
To
compensate
for this, al
l
Ze iss lenses, except for
the
M
irotar
lenses
,
are
provid
ed w
ith an
infrared
correcti on
mark
(a
lso ca
ll
ed
"R ind
ex
")
.
First.
focus
in
the
normal manner, th en
rea
lign the
d is-
t
ance read ing w
hi
ch
is
indexed
on the
f
ocusing
ring
to
the
"R
index" mark
. In th
e photos
, correcti
on has
been
made
at
inf inity
by
rea ligni ng
the
inf in ity mar
k
(00)
to
the R index
.
•
A
lways
use a
red
filter
for
infrared photography.
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