Nikon SB-140 instruction manual Setting Sensor Unit SU-3, For manual operation

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.

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 selected aperture.

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 its full output.

Detaching the Sensor Unit

Push in the two protruding catches at the base of the SU-3 and pull out the SU-3 Sensor Unit.

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