The 82mm Variable Neutral Density Filter from Bower gives you the capability of shooting with high speed film or high ISO settings on your digital camera, even in direct sunlight. ND filters reduce the amount of light that reaches your film or your sensor, and this variable ND filter allows you to choose just how much light you want to block from 2 to 8 stops. To adjust the amount of light, simply turn the adjustable dial for a seamless adjustment.

https://www.bhphotovideo.com/c/product/1092651-REG/bower_fn82_82mm_variable_neutral_density.html/overview