#Circular Polarizing Filter

sə́rkjələr póləràjzɪŋ fɪ́ltər

A circular polarizing filter is a photographic filter that is attached to the front of a lens in order to cut glare and reflections. Polarizers block certain wavelengths of light from passing through and reaching the sensor and has the effect of allowing glass glare and water reflections to be seen through for a crystal-clear appearance as well as cutting glare and haze in the sky for deeper, bluer skies in sunny weather or more defined clouds when it’s overcast. Their efficiency is relative to the angle at which the light source is positioned to the camera, with 90 degrees working best. Circular polarizing filters are often used in landscape and product photography.