Nikon SB-900 - Manual (Page 50)

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C
Operation
Standby function to conserve battery power
To cancel Standby
Turn the [Power ON-OFF/wireless setting] switch to [ON], [REMOTE] or [MASTER].
Press the [Test firing] button.
Press the camera’s shutter release button halfway.
Adjusting the lead time before the Standby function is activated
The lead time before the Standby function is activated can be adjusted by
custom setting (kC-23).
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If the SB-900 and the camera are not used for
more than a specified time, the Standby function is
automatically activated to conserve battery power.
The Standby function activates when the camera’s
exposure meter is turned off (default setting). •
Batteries