Amazon.com : Hoya 77mm Variable Density Screw-in Filter : Camera Lens Neutral Density Filters : Electronics
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
Hoya 82mm II (HMC UV / Circular Polarizer / ND8) 3 Digital Filter Set with Pouch - Walmart.com
Hoya 77mm Pro 1 Digital Neutral Density 64x Filter (6 stops) | St. Cloud Camera & Photo