C-PL (Circular Polarizer) Multicoated | Multithreaded Glass Filter (37mm) For Olympus M.Zuiko Digital 17mm f/2.8 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