ND is an acronym for Neutral Density. Generally ND is used to describe a type of filter.  An ND filter will darken the scene while not affecting the colour of the scene.  ND filters are used when a photographer needs a slower shutter speed than is available with out the darkening effect of the filter.

ND filters come in a range of darkness and in a graduated format that is darker at the top and lighter on the bottom.

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