Nikon SB-500 AF Speedlight - Manual (Page 51)

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Wireless Multiple Flash-unit Photography
Checking Status in Wireless Multiple Flash-unit Photography
The flash-ready indicator on the SB-500 can be used to check the
status during and after taking a picture in wireless multiple flash-unit
photography.
Checking flash operation using the flash-ready indicator
Master flash
unit
Remote flash
unit
Speedlight status
Lights up Lights up Ready to fire
Goes out and
lights up when
ready to fire Goes out and
lights up when
ready to fire
Fired properly
Flashes slowly
for approx.
3 sec. Flashes slowly
for approx.
3 sec.
Insufficient flash output for correct
exposure
Underexposure due to insufficient
flash output may have occurred. To
compensate, use a wider aperture
(smaller f-number) or higher ISO
sensitivity, or move the flash unit
closer to the subject and reshoot.