The K&F CONCEPT Neutral Density (ND) Filter has the same and uniform ability to reduce the light of different wavelengths, won't affect the original color of the object, Can truly reproduce the original appearance of the scene; Adjustable design from ND2 to ND32, we can adjust the ND value by rotating the lens, which makes it easier for us to shoot in different situation. Adopt premium optical glass, waterproof & scratch-resistant; With it, you can get ideal shooting effects and avoid carry of a bunch of filters, so practical.