Variable ND Filter 2-400 77mm - Model: 2-400 - Size: 77mm - Accessories: Case Like new, no scratches. With a single filter, you can adjust the light reduction rate from ND2 to ND400 (ND2, ND4, ND16, ND400) (variable ND filter), and it comes with a filter case, eliminating the need to carry multiple filters. Works with lenses that have a 77mm filter thread. Thread diameter: 77mm It screws onto the end of the lens, making it easy to install. You can easily create different levels of light reduction by simply rotating the ring. Thank you for your consideration. Thank you for looking.