Expos ure control
You don’t adjust the shutter speed to control exposure with flash – aperture and flash power are key
Working out the exposure for flash is different to doing it for normal lighting. The length of the exposure is fixed by the duration of the flash, and this will depend on the flash being used and its power setting. You control the exposure using the flash power setting and the lens aperture, or you leave this to the camera to work out for you.