Blurring water motion in waterfalls, rivers, oceans, etc...
Reducing depth of field in bright daylight conditions
Adding motion blur to moving subjects: people, cars, planes
Extended exposure times
ND 3.0 1000x
Neutral Density (ND) filters reduce the intensity of all wavelengths, or colors, of light equally from entering the camera, in measured amounts. This allows the photographer more control in selecting shutter speed and aperture combinations in a variety of conditions.