Docooler Fotga 82mm ND Filter Slim Fader Variable Adjustable Neutral Density ND2 to ND400 Neutral Density (ND) filters can reduce the intensity of light equally without appreciably changing its color. Fotga fader ND filter can change the luminous flux substantially with freedom, reducing the amount of light from 2 times of the lowest to about 400 times of the hightest. It can easily replace dozens of all grades of density ND gray filters (max. equal to 3 ND9)(1 ND9 can reduce three grade light). The operation is extremely convenient when selecting your desired density, just rotating filters. The index marks on the filter let you know exactly the amount of reduction at a glance.This ND filter is highly recommended by famous photographers and film directors. If you have it, you won't need to carry a bunch of filters for shooting.Specifications: Material: Optical Glass Neutral density grade: 2-400 Back thread diameter (attach to lens, male thread): 82mm Front thread diameter (attach to additional filter, female thread): 85mm Item weight: 45g / 1.59oz Package size: 10.7 * 10.7 * 1.7cm / 4.22 * 4.22 * 0.67in Package weight: 84g / 2.96ozPackage List: 1 * 82mm Fader ND Filter