Haida 77mm Slim PROII Neutral Density Multi-Coated ND 2.7 400x Filter Made from high quality optical glass Haida PROII Slim Multi-Coated. Neutral Density ND 2.7 ( 8 1/2 Stop ) Filter Features front thread for use with multiple filters / hoods. Extremely resistant to dirt, scratches and water Super thin frame at only 3.09mm. Ideal for Wide Angle Lenses