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B Series,ND2-ND400 - K&F CONCEPT
82mm Variable ND Filter ND2-ND400 (1-9 Stops) with Putter HD 28 Multi-Layer Coatings Import AGC Glass Adjustable Neutral Density Filter for Camera Lens - Walmart.com
Amazon.com : PROfezzion 82mm Variable ND Filter, ND2-ND400 (9 Stop) Fader Multi-Coated Adjustable Neutral Density Filter for Canon EF 24-70mm f2.8L /Nikon AF-S 24-70mm f2.8E Lens & Other Camera Lenses : Electronics