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Reference — Camera 7-53
Using a Flash
WARNING: Do not connect a non-dedicated electronic flash unit to the
camera (hot shoe or PC terminal) without verification from a Nikon
authorized service facility that the flash unit is compatible with the
camera body. Some electronic flash units will damage the camera body
unless they are isolated with an IR slave or a radio slave. Check with a
Nikon authorized service facility for compatible equipment.
Flash units or flash accessories designed for dedicated use with other
camera brands will not work properly and may damage the camera
body.
When using a dedicated Nikon flash, you may need to set exposure
compensation on the camera body. Take test pictures to verify proper
exposure.
When using studio flash or non-dedicated flash you must set the camera
to manual exposure mode to set the proper shutter speed for flash syn-
chronization. Use the included Nikon N90s manual to identify shutter
speeds that work with these settings.
The shutter speed for flash synchronization with studio flash may be
different from dedicated Nikon flash synchronization. Before use, test the
flash at various shutter speeds to make sure it synchronizes properly with
the camera.
When using the camera with a studio flash, if either the SCSI cable or the
charger are connected, it may be necessary to reverse the ground polarity
of the flash cord in order for the flash to work; alternately, use an IR slave
or a radio slave to isolate the camera from the flash.
(The read-me file on the supplied driver diskette may contain additional
information regarding using a flash.)