Nikon 4804 R1 Wireless Close-Up Speedlight System - Manual (Page 91)

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Autofocus flash operation in low light
In Commander and Repeating flash operations, if light is too low for
normal autofocus operation, the SU-800’s AF-Assist Illuminator comes
on, enabling you to perform autofocus flash photography. This is
activated by a signal from the camera.
• The AF-Assist Illuminator does not work in close-up flash operation.
• The SU-800’s AF-Assist Illuminator supports CLS-compatible cameras’ Multi-Area
Autofocus system.
The effective shooting distance with the AF-Assist Illuminator:
Approx. 1m to 10m (3.3 to 33 ft) with a 50mm f/1.8 lens or less, depending on the
lens in use.
Usable lens focal length:
24mm to 105mm
Activating and canceling the AF-Assist Illuminator
You can set the AF-Assist Illuminator to activate or
cancel even when receiving a signal from the camera.
Press the [MODE] + [
W
] buttons simultaneously for
approx. 2 seconds to toggle between the AF-ILL
(activated) and the NO AF-ILL (canceled).
Notes on using the AF-Assist Illuminator
• If the focus indicator does not appear in the camera’s viewfinder even through the
AF-Assist Illuminator is on, focus manually.
• The AF-Assist Illuminator will not light up if the camera’s autofocus is locked or the
SU-800’s ready-light does not come on.
• Refer to your camera user’s manual for more information.
READY
LOCK
MODE
NO AF-ILL
SEL
A B