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Amazon.com : K&F Concept 77mm Fixed ND Lens Filter Kit, Neutral Density ND4 ND8 ND64 ND1000 Filter Set with 28 Layers Multi-Coated HD Optical Glass and 4-Filter Pouch : Electronics
Amazon.com : NiSi 77mm Circular Long Exposure Filter Kit | Includes ND8 (3 Stop), ND64+CPL (6 Stop), ND1000 (10 Stop), and ND32000 (15 Stop) Filters | Landscape Photography : Electronics
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Amazon.com : K&F Concept 77mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics