State variable filter - Wikipedia
State Variable Filter Design
Tiffen 82mm Variable Neutral Density Filter : Target
Round Continuously Variable Metallic Neutral Density Filters
Linear Variable Filters - Salvo Coatings
State Variable Filters
NiSi ND-VARIO Pro Nano Variable ND Filter
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Genustech 77mm Variable Neutral Density and Circular G-PND77 B&H
Serge Variable Bandwidth Filter (VCF2) – Patch Point
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![INON UW Variable Red Filter M67 [Overview]](http://www.inon.jp/_src/21238/uwvariableredfilter.jpg "INON UW Variable Red Filter M67 [Overview]")