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Amazon.com : K&F Concept 37mm ND2-ND400(1-9 Stop) Filter, Variable ND Filter(Neutral Density), Ultra-Slim/Nano Coating, for Camera Lens : Electronics
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Amazon.com : NEEWER 55mm Magnetic Variable ND Filter ND2-ND32(1-5 Stops) with Magnetic Adapter Ring, HD Adjustable Neutral Density Filter with Water Repellent Double Sided 30 Layer Coatings, No X Cross : Electronics
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Amazon.com : K&F Concept 58mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens, Adjustable Neutral Density Filter with Microfiber Cleaning Cloth (B-Series) : Electronics
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Amazon.com: K&F Concept 55mm Magnetic Variable ND Lens Filter ND2-ND32 (1-5 Stops) + Magnetic Basic Ring Kit, Adjustable Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Industrial & Scientific
Amazon.com : 82mm ND Variable Neutral Density Filter for Leica 90-280mm f/2.8-4 APO-Vario-Elmarit-SL Lens : Electronics
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Amazon.com : Fotga 55mm Slim Fader Variable Adjustable ND2 to ND4 ND8 ND16 ND32 ND400 ND Neutral Density Filter for Nikon Canon Sony Panasonic Olympus Fujifilm DSLR Cameras Lens with 55 mm