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k and f nd filter, Concept 49-82mm Nano-x Series Variable Nd Filter True Color Nd2-nd32 With 28 Layers Of Anti-reflection Film Waterproof - Camera Filters - AliExpress, Amazon.com : K&F Concept 52mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics