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TECHNICAL
INFORMATION-continued
__
Setting
Sensor
Unit
SU-3
3
The
Sensor Unit
SU-3
controls the operation of the
S8-
140.
It
offers a choice of five settings.
For
automatic
operation
The
0,
t::,
and
0 indexes correspond to the flstop
indi-
cators
on
the exposure calculator dial.
Turn
the
ring
on
the
front of the sensor unit to set the shooting mode selector
to the index that corresponds to the flstop selected by the
exposure calculator
dial.
At
these settings, the sensor
~
reads the light reflected from the subject
so
the S8-140
can automatically vary its light output to match the flash-
to-subject distance.
Make sure that nothing comes between the sensor
and
light reflected from the subject.
For manual operation
Set
the SU-3 to FULL
or
1/4
, depending
on
the amount of
light desired.
The
S8-140 operates manually
at
its maxi-
mum light output or
1/4
light output regardless of flash-to-
subject distance.
The
SU-3
can
be
attached to Nikon Speedlight S8-
14
or
S8-11
to enable firing of the flash unit
at
1/4
of
it
s full
output.
28
When shooting a dark subject (one with low reflec-
tivity), reduce the aperture selected by one-half to one
full flstop. When the subject
is
light
in
tone (has high
re-
flectivity), reset the aperture
so
it
is
one-half
to
one full
flstop wider. Otherwise, your pictures might come out
over- or underexposed.
When shooting a subject with very high reflectivity,
such
as
a mirror or metallic surface, take pictures
on
manual to prevent underexposure.
For
fill
-
in
flash photography
Make sure the scene brightness does not exceed the
ex-
posure value determined by the combination of the
shutter speed (synchronization speed)
and
the
se
lected
aperture.
Detaching
the
Sensor
Unit
Push
in
the two protruding catches at the
ba
se
of the
SU-3
and
pull out the
SU
-3
Sensor Unit.