Nikon F4 Body Only, F4S instruction manual Sync Terminal, Viewfinder Illuminator Switch

SYNC TERMINAL VIEWFINDER ILLUMINATOR SWITCH

A separate sync terminal is provided on the F4. It accepts all standard PC-type plug-in sync cords, and is threaded for use with a Nikon screw-in sync cord . Use this terminal to attach flash units which do not have the standard ISO hot shoe.

When it'sdark, use the viewfinder illuminator to light up all viewfinder information. Turn the switch on, and lightly press the shutter release button to illuminate the display. The illuminator automatically switches off as the viewfinder display disappears; it also momentarily switches off during exposure. Although the illuminator is automatically switched off when the camera is set to the L (lock) position, switch it off, when no longer needed, to conserve power.

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