Circular Polarizer (CPL) Filter — Compatible with Pentax HD Pentax-D FA Macro 100mm f/2.8 ED AW

Designed with an ultra-slim aluminum frame to prevent vignetting while preserving full rotation for exposure and polarization adjustment. A nonslip upper rim makes mounting, turning and removal quick and secure. The glass features double-sided, multi-layered coatings and is treated to be anti-oil, anti-dust, anti-soil, scratch & water resistant. This circular polarizing (CPL) filter reduces unwanted reflections from non-metallic surfaces such as water and glass, boosts color and contrast, and is particularly effective at deepening blue skies and whitening clouds. By arranging and filtering directionally polarized light at right angles to reflected light, it absorbs much of the glare, clears atmospheric haze in distant landscapes, and delivers richer, more saturated colors. The strongest polarization effect occurs when shooting at a 90° angle from the sun.