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Neutral density (or ND) filters reduce the amount of light that passes through the lens. This gives the photographer more control over the shutter speed and aperture to produce effects like the smoothing of water, to shallow depth of field or to show the movement of clouds.
Because the ND effect comes from the coating itself, we’ve gone to great lengths to protect it. On our rectangular filters the coating is sandwiched between two pieces of bonded glass. This protects the coating completely and allows us to lap and polish the filters to the highest tolerance in the industry, meaning your filters will have the lowest possible distortion. On our circular filters, the coating is featured on the outside of the filter because the ring protects the filter. This allows us to add anti reflective and hydrophobic coatings to the outside of our circular filters.
Firecrest filters are available between 1-10 stops of ND, plus 13 and 16 stops for long exposure.
ND filters are also available as grads or graduated ND filters. These filters provide the ND effect on a selected part of the scene. The most common use of a grad filter is to reduce the luminance of a bright sky to match the terrain below.