52mm Variable Nd Filter Nd2-400 Neutral Density Fader Adapter Ring For Gopro Hero 8 9 10 Hero8 Black Hero9 Hero10 Action Camera - Camera Filters - AliExpress
Amazon.com : ND Filter 52MM, K&F Concept Professional 52MM Fader Variable Neutral Density Adjustable ND Filter ND2 to ND400 for Nikon D5300 D5200 D5100 D3300 D3200 D3100 DSLR Cameras + Lens Cleaning