Nikon SB-5000 AF Speedlight - Manual (Page 77)

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Wireless Multiple Flash-unit Photography
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When using optical control
• Position the remote flash units so that light from the master flash unit
can reach the light sensor window for wireless remote flash of the
remote flash units. This is particularly important when holding a remote
flash unit in the hand.
• Be sure to press the master flash unit test firing button to test fire the
remote flash units after setting up.
Master flash unit
attached to camera
Remote flash units
Remote flash units
• As a basic guide, the effective distance between the master flash unit
and remote flash units is approx. 10 m (32 ft) or less in the front position,
and approx. 7 m (22 ft) at both sides (in Advanced Wireless Lighting).
These ranges vary slightly depending on ambient light.