Nikon D90 - Manual (Page 207)

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❚❚Manual
Choose a flash level between Full and 1/128 ( 1 /
128
of full power). 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.
A “Times”
Option Description
Output Choose flash output (expressed as a fraction of full power).
Times
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.
Frequency Choose how often the flash fires per second.
The options available for Times are determined by flash
output.
Output Options available for Times
1/4 2
1/8 2–5
1/16 2–10
1/32 2–10, 15
1/64 2–10, 15, 20, 25
1/128 2–10, 15, 20, 25, 30, 35