This Firecrest IRND filter reduces the light by 16 stops. This 100x100mm filter is 2mm thick and fits the Formatt-Hitech 100mm aluminum holder. It is also hydrophobic and scratch-resistant. Firecrest IRND filters for photography are made from Schott Superwite glass and feature the Firecrest IRND 15 layer multicoating on the outside of the filter.
4x5.65" Firecrest IRND Neutral Density 4.8 (16 Stops)