
X4 Neutral Density,

Amazon.com : Breakthrough Photography 82mm X4 6-Stop Fixed ND Filter for Camera Lenses, Neutral Density Professional Photography Filter, MRC16, Schott ,

Amazon.com : Breakthrough Photography 82mm X4 6-Stop Fixed ND Filter for Camera Lenses, Neutral Density Professional Photography Filter, MRC16, Schott ,

X4 UV – Breakthrough Filters,

Amazon.com : Breakthrough Photography 82mm X4 3-Stop ND Filter for Camera Lenses, Neutral Density Professional Photography Filter with Lens Cloth, MRC16, Schott B270 Glass, Nanotec, Ultra-Slim, Weather-Sealed : Electronics