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's dark, 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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