Nikon os Speedlight SB-102 - Manual (Page 20)

CONTROLS IN DETAIL —continued.
Sensor UnitSU-101 (Optional)
In combination with the optional Sensor Unit SU-101,
the SB-102 provides non-TTL automatic flash exposure
control. With the SB-102’s shooting mode selector
switch @1 at “AUTO,” the Sensor Unit SU-101 reads the
light reflected back from the subject while the speed-
light is firing and fells the speedlight to turn itself off
when the light output is sufficient for correct exposure.
The selector dial on the back of the SU-101 allows one
of two aperture settings to be selected.
Normally, the SU-101 is attached to the camera’s
accessory shoe. However, when a plastic frame finder
or optical underwater viewfinder is mounted on the
camera’s accessory shoe, the optional sensor holder is
used to attach the Sensor Unit SU-101 to the speedlight
bracket.
Mounting the SU-101 on the camera: Turn the sensor
unit’s locking wheel counterclockwise as far as it will
go, slip the unit’s mounting foot into the camera’s
accessory shoe, and turn the locking wheel clockwise
to tighten it.
Mounting the SU-101 on the bracket: Insert the
sensor holder positioning pin ® on the bracket into the
sensor holder, then screw the sensor holder’s screw
into the sensor holder socket ® on the bracket. To
attach the SU-101 to the sensor holder, follow the same
procedures as when attaching the SU-101 to the
camera’s accessory shoe.
Operating the SU-101: The two-position selector dial
on the back of the sensor unit must be set according to
the instructions in Step B-6 (page 15). To obtain the
correct exposure, position the sensor as close to the
lens as possible.
• For more information about non-TTL automatic operation, see page 24.
Synchronization Speed
The shutter speed at which the SB-102 synchronizes with
a camera depends upon the camera being used. The
table shows the flash sync speeds of various cameras.
Both the Nikonos-V and Nikonos IV-A cameras auto­
matically switch to the proper synchronization speed
when the SB-102’s power switch is turned on; when the
switch is turned off, fhe automatic switchover function is
canceled. For convenience, the SB-102 provides infor­
mation and warnings through these cameras’ viewfinder
ready-lights.
• Aperture-priority automatic exposure mode ("A") operation on the
Nikonos-V and Nikonos IV-A is canceled when the SB-102 is turned on.
To determine the correct aperture, use the SB-102's exposure calcula­
tion dial (see page 22).
Camera Sync Speed Camera Setting Operable Shutter Speed Viewfinder Information Remarks
A 1/90 sec.
Nikonos-V* 1/90 sec, or slower
1/1000 to 1/125 sec. 1/90 sec. Correct shutter speed blinks** TTL operable
1/60 to 1/30 sec. as set
M90 or B as set —
Nikonos IV-A* 1/90 sec. or slower
A 1 /90 sec. LED does not light
TTL inoperable
M (1/90 sec.) or B as set —
Nikonos III 1/60 sec. or slower — as set —
* W hen batteries in the Nikonos-V or Nikonos IV-A are exhausted, reset the Nikonos-V's shutter speed/mode selector dial to M90 (1/90 sec.) or B
(Bulb), or the Nikonos IV-A's shutter speed dial to M (1/90 sec.) or B (Bulb). TTL automatic flash control is not possible when the Nikonos-V is
in the M90 or B modes.
* This indicates the correct shutter speed as determined by the subject's brightness and the aperture setting. Although this is not a speedlight
function, it is helpful when using daylight fill-in flash shooting.
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