ARRI Full-Spectrum Neutral Density (FSND) filters offer superior image control with maximum flexibility and no optical compromise. ARRI FSND filters are surfaced coated, with highly-polished high optical quality glass as a base. They are distortion free, even when used in conjunction with long focal length lenses. Perfectly color neutral, exceptionally resistant to flare and glare, protective of the color within the scene, and introduce no discernible image distortions at even the longest focal lengths, they eliminate far red contamination without affecting skin tone. FSND0.3 reduces light by 1 stop, FSND0.6 reduces light by 2 stops and FSND0.9 reduces light by 3 stops.