Amazon.com : Heliopan 67mm UV SH-PMC Filter (706711) with Specialty Schott Glass in Floating Brass Ring : Camera Lens Sky And Uv Filters : Electronics
Amazon.com : Heliopan 82mm Variable Gray Neutral Density Filter (708290) with Specialty Schott Glass in Floating Brass Ring : Camera Lens Neutral Density Filters : Electronics
Heliopan ships Vario ND variable filters in sizes from 55 to 82mm: Digital Photography Review