67mm Neutral Density ND ND16 Filter 4 Stops (1.2) Optical Glass Lens For Camera 614993413510 | eBay
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NiSi 150x170mm Nano IR Soft Graduated Neutral Density Filter - ND16 (1.2) - 4 Stop | NiSi Optics USA
Amazon.com : PROfezzion 49mm Soft Circular Gradual ND Filter, ND2-ND16 (4 Stop) Grad Neutral Density Filter for Canon EOS M50 Mark II M200 /Sony FE & Other Lenses with 49mm Filter Thread :