The 4 x 4" Firecrest Ultra Cinema ND Filter Kit 1 from Formatt Hitech includes ND 0.3, 0.6, and 0.9 filters, which offer 1-, 2-, and 3-stop exposure reduction, respectively. These filters use a rare earth mineral coating to result in hyper neutral NDs. They feature 4mm thick Schott Superwite glass, and the multi-coating is bonded in the middle to increase scratch resistance. Firecrest filters are neutral across all spectrums, including UV, visible, and infrared.
