Instruction manual

A.
To adjust
the
lens
to the
required
distance, without
use
of the
f
inder, simply
rotate
the
focusing ring and
set
the
distance
opposite the orange-
colored
index.
When
the
lens
is
focused,
there
is
an apparent
zone of
sharp-
ness, both
in
front
and back of
the
focused
plane,
which is
known
as the depth
of
f
ield.
*
See
the depth of
field
table
for the
Zenzanon-PG 100mm
lens
on
page
37.
B.
The
depth
of
field
scale,
next
to the distance
scales,
shows
the
zone
of apparent
sharpness
at
any
lens opening
or distance
and is made up of
identical
pairs
of apertures on
both
sides
of the distance index.
These
identical
pairs
of aper-
tures
indicate
the distance that
will
be
in
focus
at these aper-
tures.
For
example, if the 100
mm
lens is
focused
at a distance
of 3
meters,
it
can be seen
f
rom
the
depth
of
field
scale that
the
zone
willextend
from2.2 to 4.8
meters,
when
a lens opening of
F22
is used.
In
infrared
photography,
some
adjustment
is required in the
focus
in
order to
retain
sharp-
ness on
the
film,
because the
invisible
infrared
rays
are
longer
in
wave
length than the visible
rays used
for focusing.
For
infrared
photography
:-
1. Use
an R
filter
or equivalent
with an
inf rared
(black-and-
white)
film.
2. The
red-colored line,
next
to
the
orange-colored
distance
in-
dex,
is the infrared index.
3.
After
focusing in
the
normal
manner,
re-set the
distance
in-
dicated
by the orange-colored
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