Amazon.com : NEEWER 58mm Variable ND Filter ND8-ND128 Camera Lens Filter (3-7 Stop) No X Cross Neutral Density Ultra-Slim HD Filter with 30 Multi-Layer Nano Coatings Waterproof, Cleaning Cloth Included : Electronics
Hoya 58mm Variable Density II Filter A-58VDY-II B&H Photo Video
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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Tiffen 58mm Variable Neutral Density (ND) Filter - 2 to 8 Stop #58VND FAST SHIP | eBay