Nikon SB-5000 Owner's Manual

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Functions
En-01
 
AF-assist illumination/canceling flash function
AF-assist illumination can be activated or canceled in the custom settings. 
The flash function can also be canceled in the custom settings while AF-
assist illumination is activated (0B-24).
AF-assist illumination activated while flash function activated 
(Default)
AF-assist illumination canceled while flash function activated. No AF 
appears.
AF-assist illumination activated while 
flash function canceled
v
 When autofocus is not possible while using the AF-
assist illumination
If the focus indicator does not appear in the camera’s viewfinder even  
when the AF-assist illuminator lights up, select the central focus point and 
use autofocusing, or focus manually.
t
 Using the SB-5000 off-camera
When using the SB-5000 off-camera with the TTL Remote Cord SC-29, 
autofocus in low light is possible because the SC-29 features an AF-assist 
illumination function (0H-16).