Nikon SB-500 AF Speedlight - Manual (Page 71)

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Tips on Speedlight Care and Reference Information
Status Flash-ready indicator Cause/solution 0
Flash has not
fired
Flashes 4 times over 0.5 sec.
at intervals of 0.5 sec.
The camera does not
support CLS. Flash cannot
be used. Use a CLS-
compatible camera.
—
Flashes 4 times over 0.5 sec.
at intervals of 0.5 sec. for
approx. 6 sec.*
2
• Non-TTL auto flash
control mode is set
on the master flash
unit. Change the flash
control mode to an
operable flash control
mode.
• The remote flash
unit light sensor has
failed to receive the
command light from
the master flash unit.
This is because the light
sensor cannot detect
when to stop firing in
sync with the master
flash unit, either due
to a reflection from the
remote flash unit itself
or light from another
remote flash unit that
may have entered the
light sensor window.
Change the direction
or position of the
remote flash unit and
reshoot.
E-11
*2 When used in remote mode