The ND 400 can be used in many creative ways to achieve super slow shutter speeds in daylight. It can create beautiful blurred motion or render moving subjects invisible.Photographing solar eclipses and ultra-bright light sources can be extremely dangerous. This filter reduces light values by 9 stops to less than 1/500th of its original intensity and allows safe photography. It can also be used to achieve super slow shutter speeds in daylight to render moving subjects invisible.