without
front finders
showing
their
individual fields. These lenses are
attached
to
the
Cine-Kodak Special by means
of
an adapter. One
adapter can be used
with
the
2-inch, 2Yz-inch, 3-inch, 4-inch, 4Yz-inch,
and 6-inch lenses. A special adapter is needed
with
the
IS
mm.
f.2.7
wide-angle lens, because
it
requires a different lens
in
the
finder.
The
adapter used
with
the
six telephoto lenses has a glass view finder
for
the
2-inch lens, and hinged masks
to
indicate
the
fields covered by
any three
of
the
2Yz-, 3-, 4-, 4Yz- and 6-inch
telephoto
lenses. When
the
adapter is
attached
to
the
turret
head
as
described above, any of the six
telephoto lenses may be securely seated
in
it
by sliding the lug on
the
lens
into
a
slot
in
the
adapter and
tightening
its
rotating
collar.
Full
instructions are included
with
each lens.
LENS SPEED:
The
"speed"
of
a lens
is
designated by the
ratio
of
its
largest
diaphragm
diameter
to
its focal length. Thus, a
"fast"
lens
has a large diameter in relation
to
its focal length.
The
smaller
the
"f." number,
the
"faster"
the
lens. When
comparing'
I"
values for
relative speeds,
the
numbers must be squared.
USES
OF
VARIOUS
LENSES:
The
magnification
of
the image de-
pends upon
the
came
ra
distance and
the
focal
length
of
the
lens.
With
anyone
lens,
the
size
of
the
image can be changed
by
moving
the camera
away
from
or
closer
to
the subject.
Since
it
is
often
not
convenient nor even possible
to
approach
or
withdraw
from
the
subject,
it
is necessary
to
use a lens
of
different
focal
length
. Lenses
of
short
focal
length
take
in a
wide
angle
of
view;
lenses
of
lon
g focal
length,
a
narrow
angle.
Unsteady screen results caused
by
camera movement increase
with
the
focal
length
of the len
s.
Always
use
a trip
od
with the 2Yz-inch, 3-inch,
4-inch,
4Yz-inch and 6-inch telephoto lenses.
In general,
the
uses
of
the
various lenses are:
15
MM.
1.2.1
WIDE-ANGLE LENS:
For
including a large area in
confined quarters. Valuable for
interior
work
. Also useful in
photo-
graphing
buildings, where trees
obstruct
the
view.
1-INCH,
1.1.9 LENS: This is
the
le
ns
regul
arly
supplied
as
it
is best
for general
work.
33
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