Tiffen 72mm Variable Neutral Density Filter 72VND B&H Photo Video
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K&F Concept 72mm Fader ND Lens Filter Variable ND2 to ND32 for Camera no x Spot | eBay
Amazon.com : K&F Concept 72mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof : Electronics