Hoya 52mm Digital Filter Kit II HK-DG52-II B&H Photo Video
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Hoya 72mm UV HMC + Cicular Polarizer CPL + NDx8 3-piece Digital Filter Set Kit - Walmart.com
Amazon.com : Hoya Pro ND Kit (8/64/1000) 58 mm, Practical Set with 3 Different Hoya PRP ND Filters for Light Reduction, Neutral Density Filter, ND Filter, Long Time Lighting : Electronics
Amazon.com : Hoya 67mm PROND ND 1000 Neutral Density Filter for Camera : Electronics