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Film
choice
Using
film
with
a
speed
of
ASA/lSO
400
or
higher will
allow
you
to use
faster
shutter
speeds,
thereby
mini-
mizing
the effects
of camera
movement as
much as
possible.
When
to use a speedlight
1)
To
restore naturalcolors
to the subiect
When
shooting
color
film without
a
speedlight,
your
photos
will come out
bluish because
of the selective
filtration and
light absorption
of water. Using
a speed-
light
will
allow
you
to capture
the subject
in all
its
solendor.
2)
To add
illumination
to the subiect
']lIF::
When
shooting
a subject
that
is
partially
in
darkness
(such
as the
inside of
an
underwater
cave
or
a
face
behind
a diver's
mask), use
a
speedlight
to
provide
more
illumination.
Underwater
photography
and
speedlight
guide
numbers
Because of the
light absorption
of water,
the
guide
number of a speedlight
is lower
underwater
than it is
on land.
Also, because the transparency
of
the water
varies
from
situation
to situation,
it is difficult to
calculate the aperture
setting
f rom the
guide
number.
As
a
rule
of thumb,
use the
following
formula to calcu-
late the aperture
from the
guide
number
when using
a speedlight
in fairly transparent
water.
\112to
113)
Guide
Number
=
f/stop
Flash{o-subject
Distance
Poor visibility
may reduce the
maximum shooting
distance
and
guide
number even
further.
For
best
results, take
the
f irst
shot
at the
recommended expo-
sure,
then take
two additional
shots
with the lens at
the
next two
numerically smaller
f-numbers.
To compensate
for light
loss in
the
A mode, use the
Sensor Unit
SU-101
when using the
SB-10'1
in
the
automatic
mode. Even though
the
maximum shooting
distance
will be cut
in half,
you
will
still
obtain the
correct
exposure.
When
shooting
manually, divide the
speedlight
guide
number by two.
In the TTL
mode,
the
SB-103
or SB-102
automatically
provides
the
correct
flash exposure.
OJ
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