This filter is purely designed to reduce the amount of light entering the lens without affecting the colour tones ie a neutral colour shift. Particularly useful in strong light & high contrast situations for example snow or Mediterranean beach scenes where the camcorder s auto exposure can be operating out of its normal range. It can also be used to force a slower shutter speed for creative effects. An ND4 filter is equivalent to 2 f stops & an ND8 filter to 3 f stops Supplied in a protective plastic case.