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Film choice
Using
film
with a speed of ASAIISO 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 natural colors to the subject
When shooting color
fi
lm
without a speedlight, your
photos will come
out
bluish because of the selective
filtration
and
light
absorption of water.
Using
a speed-
light wil
l
allow you
to
capture the subject
in
all its
splendor.
2) To add illumination to the
subject
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 speed
light is lower underwater than it
is
on land. Also, because
the
transpa
rency
of the
water
varies from situation to situation, it
is
difficult to
calculate the aperture setting from 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.
(1/2 to
1/3)Guide
Number
Flash-to-subject Distance
f/stop
Poor
vis ibil ity
may
reduce
the maximum shooting
distance
and
guide
number
even further.
For
best
results, take the first 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-101 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.
63
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