Nikon SB-27 - Manual (Page 45)

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in all groups)
Synchronization in continuous shooting
The SB-27 is able to recycle fast enough to synchronize with a
motor-driven camera firing continuously up to 15 flashes per
second. It is possible to take up to four full flash pictures in rapid
succession at a light output ranging from 1/8 to 1/16 (using the
SB-27’s internal batteries) in Manual (M) Flash mode.
Number of continuous flash (frames) in Manual (M) Flash mode
Light output
Power source
1/8 1/16
AA-type alkaline-manganese
4 8
(four sets) inside the SB-27
Optional external power source
SD-7 + AA-type alkaline-manganese
6 10
(four sets) inside the SB-27
Optional external power source
SD-8/8A + AA-type alkaline-manganese
5 10
(four sets) inside the SB-27
SB-27's light output Max. number of flashes
AUTO and Manual (M) mode at 1/1 or 1/2
15
light output
Manual (M) mode at 1/4, 1/8 or 1/16 light output 40
Note: The maximum number of flashes may vary with the type of battery
and the ambient temperature.
Allow the Speedlight to cool off for at least 10 minutes after
continuous firing (see the table below). Overuse generates
heat that could shorten the life of the Speedlight.
Safety range in continuous firing
We recommend letting the flash unit cool off after any level of intensive use.