100mm Standard Neutral Density 3-Filter Kit Neutral Density filters produce a grey neutral effect and are used to reduce light in photography Fits the Formatt-Hitech 100mm holder system Made from the highest quality optical resin Made in the UK on advanced computer-controlled manufacturing equipment Compatible with Canon, Sony, Nikon, Tokina, Sigma, Zeiss, Panasonic, Tamron, Samyang, Rokinon and other lens brands