Nikon SB-80DX - Manual (Page 62)

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Autofocus flash operation in dim light
Usable cameras and lenses Cameras with autofocus function + autofocus lens
When the light is too dim for normal autofocus operation, the SB-80DX’s
AF-Assist Illuminator enables you to perform autofocus flash photography
in dim light.
In dim light, the AF-assist illuminator turns on automatically when the camera’s
shutter release button is lightly pressed if an AF lens is mounted and the
camera’s focus mode is set to S (Single Servo AF with focus priority), AF, or A.
nThe effective shooting distance with the AF-assist illuminator is approx. 1m to 10m with a
50mm f/1.8 lens or shorter, depending on the lens in use.
nUsable lens focal length: 24mm to 105mm (35 to 105mm for F-501/N2020 cameras)
nThe AF-Assist Illuminator is activated when U appears on the LCD panel.
The AF-Assist Illuminator is canceled when S appears on the LCD panel.
nThe AF-Assist Illuminator is set to activate when shipped from the factory.
nIf the focus indicator does not appear in the camera’s viewfinder even through the
AF-Assist Illuminator turns on, focus manually.
nRefer to your camera’s instruction manual.
The AF-Assist Illuminator will not light up, if:
nThe autofocus is locked or the ready-light does not come on.
nThe camera’s center focus area is not selected with cameras having Focus Area
selection. For details, refer to your camera’s instruction manual.