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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.