Tiffen 40.5mm Circular Polarizing Lens Filter and Lens Cleaning Brush BundleThe circular polarizing filter absorbs rays of sunlight. Polarizers are two part lenses that rotate, allowing you to select the degree of additional saturation, contrast and glare reduction desired. They eliminate the whitish glare from highly reflected surfaces like glass and water. A Circular Polarizer has the same effect as a polarizer filter and is used on cameras with beam splitting metering systems commonly found on auto focus SLRs (for most