40.5MM Variable Neutral Density Slim Filter - ND ND2 to ND400 Filter For Sony Alpha a6500, a6300, a6000, a5000, a5100, NEX 5 6 - Nikon 1 AW1, J1, J2, J3, J4, J5, S1, S2, V1, V2, V3 Digital Camera THE IDEA BEHIND THE ND: Is that they are supposed to be totally neutral in color, cutting down the amount of light passing through the lens without changing the color of the resulting. THE VARIABLE FILTER: Is adjustable from ND2 to ND400. ND2 will block out 1 Stop of light - ND4 2 Stop - ND8 3 Stop - ND16 4 Stop - ND32 5 Stop - ND64 6 Stop - ND128 7 Stop - ND256 8 Stop - ND400 9 Stop. - COMPATIBLE Sony 16-50mm f/3.5-5.6 OSS Alpha E-mount Retractable Zoom Lens Nikon 1 NIKKOR 11-27.5mm f/3.5-5.6, NIKKOR VR 30-110mm f/3.8-5.6, NIKKOR 10mm f/2.8, NIKKOR 18.5mm f/1.8 Lens, Samsung 20-50mm f/3.5-5.6 ED II Lens