Amazon.com : Breakthrough Photography 77mm X2 10-Stop Fixed ND Filter for Camera Lenses, Neutral Density Professional Photography Filter, MRC8, H-K9L Glass, Nanotec, Ultra-Slim, Weather-Sealed : Electronics
Amazon.com : Breakthrough Photography 49mm to 77mm Step-Up Lens Adapter Ring for Filters, Made of CNC Machined Brass with Matte Black Electroplated Finish : Electronics