CONTROLS IN DETAIL-continued____
Sensor Unit SU-101 (Optional)
In combination with the optional Sensor Unit SU-101, the S8-102 provides non-TTL automatic flash exposure control. With the S8-102 's shooting mode selector switch ® at "AUTO," the Sensor Unit SU-101 reads the light reflected back from the subject while the speed- light is firing and tells 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'saccessory 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'slocking 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'sscrew 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 'saccessory 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 S8-102 synchronizes with a camera depends upon the camera being used. The table shows the flash sync speeds of various cameras.
80th the Nikonos -V and Nikonos IV-A cameras auto- matically switch to the proper synchronization speed when the S8 -102'spower switch is turned on ; when the switch is turned off, the automatic switchover function is canceled . For convenience, the S8-102 provides infor- mation and warnings through these cameras 'viewfinder ready-lights .
•Aperture-priority automatic exposure mode ( HA H) operation on the Nikonos ·Vand Nikonos /V·A is canceled when the 5B·102 is turned on. To determine the correct aperture, use the 5B -102 's exposure calcula- tion dial (see page 22).
Camera | I | Sync Speed | I | Camera Setting | I Operable Shutter Speed | I Viewfinder Information I | 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·· | ITLoperable |
| | 1/60 to 1/30 sec. | as set | | |
| | | | | |
| | | | M90 or B | as set | - | |
Nikonos IV·N | | 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 | - | |
.When battenes In the Nlkonos·V or Nlkonos IV·A are exhausted, reset the Nlkonos-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 (1190 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.
