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Circular Variable Metallic Neutral Density Filters
This is the world's first variable graduated ND filter: Digital Photography Review
Amazon.com : JJC Metal Lens Filter Stack Cap Filter Protective Case for 77mm Ultraviolet UV Filter Circular Polarizer CPL Filter Neutral Density ND Filter and More Filters in 77mm Thread Size,Upgraded Slim
Amazon.com : 82mm Variable Fader ND2-ND32 ND Filter and CPL Circular Polarizing Filter for Canon RF 15-35mm f/2.8L is USM Lens & Canon RF 24-70mm f/2.8L is USM Lens (Now Includes 95mm