Nikon D300 User Manual page 318

Manual
Choose a flash level between [Full] and [1/128] (
At full power, the built-in flash has a Guide Number of 18/59 (m/ft.,
ISO 200, 20°C/68°F).
Repeating Flash
The flash fires repeatedly while the shutter
is open, producing a strobe-light effect.
Press 4 or 2 to highlight the following
options, 1 or 3 to change.
Option
Output
Times
Frequency Choose how often the flash fires per second.
A
"Times"
The options available for [Times] are determined by flash output.
Output
1/4
1/8
1/16
1/32
1/64
1/128
U
292
Choose flash output (expressed as a fraction of full power).
Choose the number of times the flash fires at the selected
output. Note that depending on shutter speed and the
option selected for [Frequency], the actual number of
flashes may be less than selected.
Options available for [Times]
2–10, 15, 20, 25, 30, 35
Description
2
2–5
2–10
2–10, 15
2–10, 15, 20, 25
1
/ of full power).
128