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Amazon.com : NiSi 72mm Swift True Color ND-Vario - Variable Neutral Density Filter 1-5 Stops (ND2-ND32) - Rotating Adjustable ND, Compatible with NiSi Swift System Filters - Optical Glass, Waterproof Nano Coating : Electronics
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Amazon.com : Hoya 72mm Variable Density Screw-in Filter : Camera Lens Neutral Density Filters : Electronics
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