IRIX Edge 52mm ND8 Neutral Density 0.9 Filter (3-Stop)
NiSi 52mm HUC PRO Nano IR Neutral Density Filter ND8 (0.9) 3 Stop | NiSi Optics USA
Amazon.com : K&F Concept 52mm Variable Neutral Density Lens Filter ND8-ND2000 (3-11stop) Waterproof Adjustable ND Lens Filter with 24 Multi-Layer Coatings for Camera Lens (D-Series) : Electronics
Irix Edge Neutral Density ND8 filter 52mm | Official Irix brand store
NiSi SWIFT FS ND Filter Kit with ND8 (3 Stop), ND64 (6 Stop) and ND1000 (10 Stop) for 52mm | 55mm | 58mm | 62mm Filter Threads + Case | NiSi Optics USA