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 67mm Variable Neutral Density Filter
Hoya Variable Neutral Density Filter - 55mm — Glazer's Camera Inc
The New Hoya Solas IRND Neutral Density Filters Cut Down On Exposure, Infrared Radiation