Nikon SB 900 User Manual - Page 109
For cameras having a built-in Speedlight
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Flash modes and functions ■ AF-assist illuminator/flash firing 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. : The SB-900's actual flash firing is canceled. The AF-Assist Illuminator only comes on D v 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. t 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) t 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. D-59
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