Nikon D300S User Manual page 310

Manual
Choose a flash level between Full and 1/128 (
full power, the built-in flash has a Guide Number of 17/56 (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
A
"Times"
The options available for Times are determined by flash output.
Output
1/16
1/32
1/64
1/128
U
284
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.
Choose how often the flash fires per second.
1/4
1/8
1
/ of full power). At
128
Description
Options available for Times
2
2–5
2–10
2–10, 15
2–10, 15, 20, 25
2–10, 15, 20, 25, 30, 35