ND4 filter ND4 (ND0.6) filter reduce the amount of light entering the lens so wider ... emphasize movement.Size:25mm,27mm,28mm,30mm,30.5mm,34mm,37mm,40.5mm,43mm,46mm,49mm,52mm,55mm,58mm,62mm,67mm ... w/o water repellent, Multi-coated with water repellent. ND4 filter ND0.6 filter 49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm ...