ZOMEi? Ultra Slim AGC Optical Glass PRO Fader Variable Density Neutral Gray ND X Lens Filter - 67mm Ultra Slim AGC Optical Glass PRO Fader Variable Density Neutral Gray ND X Lens Filter Smooth rotating to desired density Offers ND2-ND400 neutral density ,Retains optical quality at all settings Allows use of fast film and high aperture outdoors Great for motion blur and selective focus