Nikon SB-102 os Instruction Manual - Page 21
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"AUTO"
-Non-TTL Automatic Flash Mode
When the optional Sensor Unit SU-101
is
used
, this
mode provides
non-TTL automatic fl ash
operation.
In
thi
s
mode,
the sensor unit
reads
th
e
light refl ected back
from
the
subject
while
the speedlight
is
firing and
tells
the
speedlight
to turn itself off
when
the
light
output is
sufficient
for
correct exposure. The se
lector dial on
the
back
of the SU -101
allows one
of two
aperture settings
to be selected according to the flash -to -subject distance
and the shooting situation
.
-
In
both the
TTL
and
non-TTL
automatic flash
modes,
the
8B-l02
emits
amounts of light sufficient
for
subjects
having average
reflectivity.
Therefore,
correct exposure may not be obtainable
if
the
subject's
reflectivity
is extremely
low
or
high.
Shooting Mode Selector
®
The shooting mode selector
5
has
five click-stop set-
tings
.
The shooting modes that can be used with specific
cameras are listed on page
28.
"TTL"
position-TTL (through-the-lens) Automatic
Flash Mode
This
mode,
which can be used only in conjunction with
th
e Nikonos
-V
camera, automatically controls the
flash
exposure
Through-The-Lens
(TTL). In this mode, the
Nikonos -V's 8PD (silicon photodiode) reads the light
passing through the lens and automatically signals the
88
-102
to turn itself off when the exposure is correct.
Because the range of useable ape rtures is larger (trom
f/2 .8 to f/22 when using
ASAIISO
100 film) than with
non-TTL flash, you can shoot at a variety of flash-to
-
subject
distances.
The farther the
subject,
the more
light emitted by the flash unit; the closer the
subject,
the less light given
off.
In addition
,
the TTL mode makes
daylight fill -in fla sh and close-up photography easier
than ever.
-
The useable film
speed
range
for TTL
operation is from
ASA/ISO 25
to
400.
For information about the apertures that can be used at va rious
film
speeds, see
page 23.
-
TTL
operation
is
not possible
with
the
Nikonos
IV-A
or
III
or
when the
Nikonos
-V's shutter speed/mode selector
dial
is set
at M90
(lI90sec.J
or
B(Bulb).
-
Even
if
the
Nikonos-V's shutter speed/mode selector
dial is
set
from
1/30 to
1/I000sec.,
TTL
operation
is not possible when
:
the
sync cord
is not securely
connected,
the ASA/ISO film
speed is set
beyond
ASA/180
400,
or
the batteries are completely
exhausted.
"MFULL", " M1/4"
and
"
M1/16"-Manual Flash
Modes
Manual control
is
very conven ient when the correct
exposure cannot be obtained through non-TTL auto
-
matic operation
.
The S8
-102 has
three manual control
modes
for selection according to
the
fl ash-to -subject
distance
and
the
shooting situation
.
The guide
numbers
are
GN
32 (16) at the
"
MFULL" position,
GN 16 (8) at
" M1/4,"
and GN 8 (4) at
"
M1/16
"
(when using ASA/ ISO
100 film
.
The
guide
numbers
in
parentheses
are for
underwater photography).
To
determine
the
correct
aperture, use the
exposure calculation dial or perform
the calcu
lations
yourself (see
pages
25 to
26).
21