הברון קיימים פיתוח של circular nd filter למשוך קישוט ממאיר
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
NiSi Circular ND Filter Kit
NiSi Circular ND Filter Kit - 82mm
Blackstone ND Circular Filters — Wine Country Camera
Circular Polarizer Screw-In Filter - 25CP – The Tiffen Company
Artcise Filter 2 in 1 ND2-32+CPL Circular Polarizing Filter ND Filter Ultra Quality Multi-Coated CNC Super Slim Frame 58-82mm
ND Filter vs Polarizer: What's the Difference? - 42West, Adorama.