Polarizing filters are used to select the light rays that enter the camera lens. They can remove unwanted reflections from non-metallic surfaces, such as water or glass, and enhance colors, providing better contrast.

The effect can be observed through the viewfinder and can be changed by rotating the filter. The filter factor varies depending on the way the filter is rotated and the direction towards the sun. It also allows colors to become more saturated and appear clearer, with better contrast.

This effect is often used to increase contrast and saturation in blue skies and white clouds. HOYA polarizing filters do not affect the overall color balance of a shot.