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Amazon.com : Fotga 52mm Slim Fader Variable Adjustable ND2 to ND4 ND8 ND16 ND32 ND400 ND Neutral Density Filter for Nikon Canon EF-S 24mm F2.8 Sony Panasonic Olympus Fujifilm DSLR Cameras Lenses :
Amazon.com : NEEWER 52mm ND/CPL/UV/FLD/Close Up Filter and Lens Accessories Kit with ND2 ND4 ND8, Close Up Filters(+1/+2/+4/+10), Tulip Lens Hood, Collapsible Rubber Lens Hood, Lens Cap, Filter Pouch : Electronics
Amazon.com : K&F Concept 52mm Variable ND Lens Filter ND2-ND400 (1-9 Stops) 18 Multi-Layer Coatings Adjustable Neutral Density Ultra Slim Lens Filter for Camera Lens (K-Series) : Electronics
Amazon.com : Amazon Basics Circular Polarizer Camera Lens Filter - 52 mm : Electronics
Amazon.com : NEEWER 52mm Lens Filter Kit: UV, CPL, FLD, ND2, ND4, ND8, Lens Hood and Lens Cap Compatible with Canon Nikon Sony Panasonic DSLR Cameras with 52mm Lens : Electronics