Sets how the focus point is highlighted in red in the viewfinder. Settings available are:
•Auto (default) - Lights as needed to provide contrast with the background.
•On - Focus point is always illuminated.
•Off - Focus point is never illuminated.
Supported only on D200, D3, D3S, D3X, D300, D300S, D600, D610, D700, D7000, D7100, D80, D90,
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