C–21CFlash ModesRepeating Flash ModeCamera’s LCDCamera’s LCDCalculate the aperture f-number fromthe flash-to-subject distance and theguide number, and set the camera’saperture accordingly.To determine the f-number, see “Guide Number,•Aperture and Flash-to-subject Distance.” (0H-4)Aperture cannot be set with the SB-910.•The effective flash output distance that matches the•flash output level and aperture is displayed.Set the camera shutter speed.Determine the shutter speed with the equation•below, and set a lower camera shutter speed thanthe calculated shutter speed.Shutter speed = number of flash firings/ frequency of flash firingsIf the number of flash firings is 10 (times) and the•frequency of flash firings is 5 (Hz), set the shutterspeed for longer than 2 seconds.Bulb can be also set.•Confirm the flash-ready indicator is on,and then shoot.
