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The Formatt Hitech 3.0 Neutral Density PROSTOP 10 Stop Filter for Lee Holder has been designed for use on long exposures allowing use of much slower shutter speeds. The visible effects created by using longer exposures is the effect of motion blur on any movement within your pictures, such as clouds, waterfalls, seas and rivers. The PROSTOP filter is fitted with a foam gasket perimeter, which creates a seal between the filter holder and lens, thus reducing light spillage around the sides of the filter.