Nikon autofocus speedlight SB-900 User Manual page 109

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AF-assist illuminator/fl ash fi ring off
You can set the SB-900's AF-Assist Illuminator and flash firing to activate or cancel
in the custom setting. (kC-23)
: AF-Assist Illuminator is activated. (Default)
: AF-Assist Illuminator is canceled. No "AF" appears.
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If autofocus is impossible while using the AF-Assist
illuminator, focus manually.
If the focus indicator does not appear in the camera's viewfinder even though
the AF-Assist illuminator turns on, focus manually.
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Using the SB-900 off-camera
When using the SB-900 off-camera with the TTL Remote Cord SC-29, autofocus
flash photography in dim light is possible, because the SC-29 features an AF-Assist
illuminator function. (kF-11)
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For cameras having a built-in Speedlight
• Even when the camera's AF-assist illuminator is set to activate, the SB-900's
AF-Assist illuminator is given priority and the camera's AF-Assist illuminator does
not light up.
• The camera's AF-assist illuminator lights up only when the SB-900's AF-Assist
illuminator is canceled.
: The SB-900's actual flash firing is canceled.
The AF-Assist Illuminator only comes on
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