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 color or contrast. ND's are made in different densities according to the level of light reduction from 1/3 to as much as 10 stops of light. The 0.3 ND reduces light by 1 stop. The filter is also available in 100x144mm, 100mm, 144mm and 168mm sizes. Formatt-Hitech glass filters are made from the world's highest quality optical glass, Schott Superwite.
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