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Exposure Calculator Dial
®
For Automatic Operation
The
SB-ll 's exposure calculator
dial
helps you select
the
usable
range
of £/stops
for the
speed of
the film in use and
the flash
-to,subject
distance. On the dial, there are three
£/stops
to
choose
from. Each
£/stop
determines the usable
distance range in which
you can obtain
the
correct
auto-
matic
exposure.
The
automatic shooting
ranges for the
three
£/stops are
indicated by
a set of curved color-coded
lines
near
the
center of
the dial.
If the
subject
distance remains the same, the wider the
aperture
you select,
the faster the recycling time
of
the
speedlight and
the greater the maximum
shooting
dis-
tance, but the less
depth of
field in the final photograph.
16
Example 1
Conversely, if
you choose
a small
aperture,
the depth
of
field will be greater, but
the
recycling time will be longer
and the maximum
shooting
distance is less. Therefore, in
choosing
an appropriate
£/stop, you
should take
all
these
factors-
depth
of
field, recycling time
,
and
maximum
shooting distance-into
consideration.
The follOWing
examples
explain how to use the
exposure
calculator
dial:
Example 1
If you are using ASAIISO 100 film,
you can shoot subjects
at distances from 0.6-9m
(2-30ft)
at
£/4,
0.6-
6.4m
(2-
21 ft) at
£/5.6,
and 0.6-4.5m
(2-15ft)
at
£/8.
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