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FIGURE
4
~5.
Move
t
he
ia
phragl1T"-pla
te (34)
un
til
-
-
-I.c:.::...
the
plate
uncovers
the
Weston
Speed
of the
film
used.
I n
the
illu
st
ration
a
film
with
a
Weston
speed of
40
is being
u
sed.
6.
Now
the
diaphragm
and
shutter speeds
appear in correct
rela
tion
on
the
plate (34)
and
th
e
first vertical column
on
plate
(7)
to
the
Zeit
of
the sliding
calculator.
Any
combination
of shutte
r
and diaphragm set-
tings
which
appear
may be
used.
In
the case
of the
light
condition
illust rated,
only
two
combinations
may
be used,
namely
a shutter
speea
of
1/
100
with a
diaphragm setting
of
f:
18
or a
speed o
f
1/
200 at f:
12.7.
Reading
the
speed
column
s
from
top
to
bot
tom the
figures which
appear
represe
nt th
e
follow-
12
~
-
ing
f ract
ion
of
seconds
1/ 200, 1/
100,
1/ 50,
1/
25
1/
5
1/
2 and
I second.
An
exposu
re
of
1/
5
~r
1/
2 a
second
may
be
acco
mpli
shed by
using
the
bulb
setting
on
the
shutter.
Of
course,
a
tripod mu st
be
u
sed to
steady the
camera for an
exposure
of
1/
5 of a second
or
slower.
Learn to depend
upon
you
r ex-
posure
mete
r
readings.
I
n
ge
neral,
manufac-
turers Weston
ratin
gs of
film
,
change fre-
quently
a
nd
it
is
ad
visab
le to
notice closely
all film
s
for
changes
in
rating.
I
f
a
ll
negati
ves
are
sli ghtly
overexposed
, use
t he
nex
t fa ster
West on setting. If
underexposed
u
se
th
e
next
slower
W
eston
rating.
Daylight Tungsten
Agfa
F
ine
Grain
Plen achrome
20
12
Finopa
n
20
16
Ultra
Speed Pan
120
60
Supreme
Superpan
60
40
DuPont
XL
Pan
64
40
F.
G.
Parpa
n
10
8
Superior
Pa
n
40
24
Eastman
Plus
X
40
24
Panatomic X
24
16
Super XX
80
50
Gevaert
Express
Superchrome
6
3
Panchromosa
20
12
Perutz
F'ernomnia
Fi
lm
16
10
13
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