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The
preceding table lists popular films
and
their
current
Weston ratings. If the ratings
do not
coinside
with the Weston markings
on
the
Argus Exposure
meter use
the
closest
setting which
does
appear.
Color
film
s
with a
Weston
rating of 6
may be
set on the exposure
meter by lowering
slide (34)
until the
finger tab
is in
direct
contact with the finger tab on slide (33) and
arrow
(
12)
is covered
by the top
slide.
The Argus
meter
and the above
film
rat-
ings result
in
a correctly exposed 35
mm.
negative
suitable for
enlarging.
SETTING THE SHUTTER SPEEDS
Shutter speeds are
set
by turning the
knurled ring
(II)
until
the indicator mark
is directly a bove
th
e
desired speed. A setting
midway
between
ma
rked
speeds
will result
in
tnal
fraCTion
of-
SC
GoR4......FGr_
example-witb
-
_
......
_
the indicator between
1/
50 and
1/
100
the
shutter will operate at
1/
75 of a second
.
The
shutter speeds are as follows
1/
25, 1/ 50,
1/
100, 1/ 200, "8"
and
"T".
The "T" is
the
proper setting
for time
ex-
posures.
When the .shutter
is
set for "Time"
one
stroke
of the
plunger (18)
will cau
se
the shutter to open and
remain
open until
a second stroke of
the
plunger is
made.
When the shutter speed
ring
is set opposite
"8" the shutter will remain open as
long
as the
plunger
(18)
is
depressed and
closes
as
the pressure is released.
When
either a "8"
or "T" setting is
used the camera must
be
held
on a
tripod.
14
SETTING THE DIAPHRAGM
The
iris diaphragm regulates the
amount
of
light
passing
through the
lens
and
is
as
im p<jrtant
an adjustment as the shutter. The
diaphragm is regulated by the pointer le
ve
r
(16).
The
diaphragm
size
is
found on
the
diaphragm
plate (12) and
they
are
indicated
as follows
: f :4.5
,
f:
6.3, f:9,
f:12.7 and f:18
.
The f :4.5
is
th
e
greatest aperture
possible
and
admits the
most
light
to the
film
.
Each
sma ller stop
admits
approximately one
half
as
much light
the
preceding one.
The
shutter
and diaphragm
settings are,
of
course,
taken directly from
the
Argus
meter.
The fas
ter
shutter
speeds with larger
diaphragm openings should
be used when it
is desirable
to stop action of the subject.
Smaller
diaphragm
openings
with
slower
shutter
sp.eeds shou ld
b
US€-:I
w
h
e
n
~a-greate
r
depth of fo
cus is
desired
for
pictures
sll ch
as
landscapes.
AIM AND SHOOT
The
camera is
aimed at the
subject
by
holding
the.
back of the
camera
firmly
against
the
face or forehead and sighting
through
the rear
view finder (5) figure I.
The
view
finder
shows
the
subject as it
will appear when photographed. The view
finder
is purposely
designed to cover slight-
ly
less
of the subject
than that
actually
photographed.
This difference provides a
safety factor and prevents
cutting
off
parts
of
interesting
subjects.
15
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