Nikon 25446-2156 D90 User's Manual - Page 207

❚❚ 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. Option Description Output Choose flash output (expressed as a fraction of full power). Choose the number of times the flash fires at the selected output. Note that Times 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. A "Times" 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 L 187