Formatt Hitech Limited HT100ND3.0 100 x 100MM (4 x 4-Inch) Neutral Density 3.0 Filter
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. The 100mm size is useable with Hitech 100mm holder systems or any 100mm (4-Inch) holder. The filter is also available in 85mm, 150mm and 165mm sizes.