Pro Glass 77mm HD MC UV Filter — Fits Canon EF 17-40mm f/4.0L USM

High-definition, multi-coated Pro Glass optical element crafted from durable optical glass. Effectively blocks ultraviolet (UV) light to reduce haze and preserve image clarity. Built with a low-profile, pressed aluminum frame to minimize vignetting on wide-angle lenses. Functions as a protective glass UV filter to shield your lens front element while maintaining optical performance.