Nikon SB-5000 - AF-Assist Illumination and Test Firing; AF-Assist Illumination for Autofocus; Test Firing the Speedlight

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Functions
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AF-assist illumination
When light is too low for normal autofocus operation, the SB-5000’s AF-
assist illumination enables autofocus photography.
• The SB-5000’s AF-assist illumination is compatible with the multi-point
AF system.
• AF-assist illumination cannot be used with non-CLS-compatible cameras
and COOLPIX cameras.
Test firing
Pressing the test firing button determines whether the SB-5000 fires
properly.
• The flash output level during test firing varies depending on settings
and flash mode.
• In master mode with wireless multiple flash-unit photography using
optical control, test firing of the SB-5000 is not possible. When the
master flash unit test firing button is pressed, the remote flash units test
fire one after another, beginning with group A.
• In master mode with wireless multiple flash-unit photography using
radio control, when the master flash unit test firing button is pressed,
the master flash unit test fires first, then the remote flash units test fire
one after another, beginning with group A.