Fotasy FF77MM 77mm Adjustable Fader ND Filter Neutral Density (ND2 - ND400) Multi-Coated Super Slim Easy to adjust neutral density freely from ND2 to ND400. Rotating it in order to change 2-8 stops. It offers you the freedom the create different neutral density freely Reduce the intensity of light without appreciably changing its color. It can be applied for different shooting conditions, such as portraiture, water falls, etc. Through the polarization angle modulation (rotate the filter ring when operating), this lens can change the luminous flux substantially with freedom, reducing the ND number from 2 to 400! The filter is made of two pieces of high polarizer (HPL) which has above 99.7 polarization and a precision rotary of the wide-angle lens ring Super Slim version, super multi-coated