Gopro Hero 8 Lens Filters | Gopro Hero 8 Black Filter - Sports & Action Video Cameras Accessories - Aliexpress
Glass ND filter for GoPro Session 4/5 – Camera Butter
Amazon.com : QKOO ND Filters for GoPro Hero 11 10 9 Black - Neutral Density ND4/8/16/32/64 Lens Filters (Directly Replace The Standard Protective Lens On Your Camera) : Electronics
Jerry Rigged ND filter set for Hero 8 and Media Mod : r/gopro
Amazon.com : Polar Pro GoPro Hero 8 Black 3-Pack ND Filter Shutter Collection ND8/16/32 : Electronics