Hoya 72mm 2X (0.3) Neutral Density Multi Coated Glass Filter 24066002631 | eBay
Amazon.com : Hoya 72mm Neutral Density ND-400 X, 9 Stop Multi-Coated Glass Filter : Camera Lens Neutral Density Filters : Electronics
Zomei 72mm Fader Variable Nd Filter Adjustable Nd2 To Nd400 Nd2-400 Neutral Density For Canon Nikon Hoya Sony Camera Lens 72mm - Camera Filters - AliExpress
Hoya PROND 72mm ACCU-ND Neutral Density Filter Kit - ND8, ND64, ND1000 & Case - Walmart.com