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Manual
Flash
Control
Manual flash operation allows
you
to control
the
light
output of the
SB-102
by
setting
the
shooting mode
selector to one of three positions: "MFULL," "M1/4,"
or "M1/16."
To
determine which setting to
use
, begin
by
aligning
the
correct shooting situation mark with
the
correct speed
on
the ASAIISO film speed scale. Next, Ipcate the
flash-to-subject distance
on
the distance scale
and
follow the corresponding distance line
up
as
it
crosses
the aperture scale.
At
each intersection between
the
distance line and
an
f/stop line
on
the
aperture scale,
one of four conditions will
be
present:
1)
the
distance
line will intersect the extreme right-hand edge of the
f/stop line (the "MFULL" mark),
2)
the distance line will
intersect a semicircle (the
"M1/4"
mark),
3)
the
dis-
tance line will intersect a triangle (the "M1/16" mark),
Example 1:
When
shooting a subject underwater at 1 m (3.3 ft) with-
out using the wide-flash adapter while using ASAIISO
100
film,
you
can select one of three aperture/mode
settings: f/16 at "MFULL,"
flS
at
"M1/4," or f/4 at
"M1/16."
If
the shooting distance changes to 5 m
(16.4
ft) but
you
still want to
use
"MFULL,"
you
should
use
an
inter-
mediate aperture setting between f/2.S and
f/4.
To
determine the correct f/stop without using the expo-
sure calculation dial, divide
the
GN
(trom the chart
on
page 26)
by
the flash-to-subject distance
(in
meters).
or
4)
the distance line will intersect
an
unmarked portion
of the f/stop line.
The
first three conditions indicate the
manual flash mode that can
be
used
at
those particular
f/stops.
Before shooting, set
the
shooting mode selector to
correct position and set
the
correct aperture
on
the lens.
Example
2:
When
shooting a subject underwater
at
4 m
(13.1
ft)
without using the wide-flash adapter while using
ASAIISO
100
film
and
"MFULL," divide the
GN
(16)
by
the shooting distance [4m (13ft)] to get the correct
aperture
(t!4).
25