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Neutral Density (or ND) filters produce a grey neutral effect and are used to reduce light in photography, enabling more control over exposure and depth of field without affecting colour or contrast. NDs are made in different densities according to the level of light reduction from 1/3 to as much as 10 Stops of light. The range is available in densities from 6 to 10 Stops. ProStops include a foam gasket which sits between the filter and the holder to help eliminate light leakage. The 150mm size is useable with Lee 150mm holder systems or similar 150mm holders. The filter is also available in 85mm, 100mm and 165mm sizes.