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TECHNICAL
INFORMATION
-continued
__
Selecting/Determining
Aperture
Automatic
operation
-
for
visible
light
only
Turn
the
exposure calculator dial until the number corre-
sponding to the film speed
is
opposite the AUTO/MFULL
index and
you
can read three usable f/stops.
Dots between the numbers
on
the film speed scale
re-
present intermediate settings.
2500 2000
12
50
64
0 500 320
250
125
80
40
20
16 10
8
1600
1000
800 400 200
160
100
64 50 32 25
12
[ffi)
IQY]
Three factors should
be
considered
in
selecting a suitable
f/stop-flash-to-subject distance, depth of field and
recycling time.
Flash-to-subject
distance
flstop indicators ® also indicate the range of flash-to-
subject distances for automatic shooting. Distance
ranges are constant, regardless of the film speed set
on
For
Manual
Operation
The
S8-140 offers a choice of light output, full or
1/4.
Depending
on
the amount of light desired, set the shoot-
ing
mode selector of the Sensor Unit at the FULL or
1/4
position.
26
the dial. 0.6 m to 8 m
(2
to
26
ft.) for the 0 indicator, 0.6 m
to 5.6m
(2
to
18ft.) for the 6 indicator, and 0.
6m
to
4m
(2
to
13
ft.) for the 0 indicator.
For example, to shoot a subject more than 5.
6m
(18ft.)
away, use the
flstop indicated by the 0
indicator-f/4
when using
ISO
100
film.
To
shoot a subject more than
8m
(26ft.) away, use the
S8-140
on
manual.
Recycl
i
ng
Ti
me
and
Depth
-
ot
-Fi
eld
With a subject distance that remains constant, the wider
the aperture selected, the faster will
be
the recycling time
of the flash unit, but the less the depth of field. With
ISO
100
and a subject up to
4m
(13ft.) away, you can select
anyone
of the three indicated
f/stops-f/4
, f/5.6 or
f/8-
taking into consideration recycling time or de
si
red
depth
of field.
Visible-light
flash
photography
Turn
the exposure calculator dial
so
the AUTO/MFULL
index
@
is
opposite the film speed
in
use for full output, or
the
M1/4
@ index
is
opposite film speed
in
use for
114
output.
Read
the f-number which appears directly above the flash-
to-subject distance, then set this aperture
on
your lens.
For example, to shoot a subject
2m
(7ft.) away at full
output with
ISO
100
, use fl16.
To
shoot the same subject
at
1/4
output, use f/8.