Circular Polarizer (CPL) for Canon EF 16-35mm f/4L IS USM — Ultra-Slim Rotatable Aluminum Filter

This circular polarizing (CPL) filter is made for the Canon EF 16-35mm f/4L IS USM and is designed to reduce reflections on non-metallic surfaces like water and glass, enhancing color and contrast in your images. It’s particularly effective at intensifying blue skies and white clouds and helps clear atmospheric haze in distant landscapes for richer, more vivid colors. The strongest polarization effect occurs when shooting at a 90° angle from the sun. Built with an ultra-slim aluminum frame to prevent vignetting, the filter still allows full rotation for precise adjustment of polarization. A nonslip upper rim makes it easy to install, rotate and remove the filter without slipping. Optically, the CPL arranges and filters directionally polarized light perpendicular to reflected light, enabling absorption of much of the unwanted reflection. Durability and handling are improved by double-sided, multi-layered coatings. The glass is treated to be anti-oil, anti-dust, anti-soil, and resistant to scratches and water, helping keep the filter clean and reliable in the field.