Digital Nc C-PL (Circular Polarizer) Multicoated | Multithreaded Glass Filter (40.5mm) Alternative To B+W 40.5mm Circular Polarizer SC Filter (Model# 65-1065294) Between 2.3 and 2.8 (approx. +1.3 stops) Rugged Metal Filter Ring (Black Finish) | Heat Treated Glass Slim Design Minimizes Vignetting Multicoated Designed For Video Or Photography | Multithreaded For Mouning Lenses Or Filters On Top