Digital Nc C-PL (Circular Polarizer) Multicoated | Multithreaded Glass Filter (58mm) For Canon Powershot G9 (Includes Lens Adapter) 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