Polarizing Filters reduce reflections and glare, they are a neutral colour and can be used for colour or black and white imaging. As the light coming from the sun is not polarized parts of the light become partially polarized due to the scattering of particles in the atmosphere. This scattering reduces the transparency of the air and creates haze in the distance and the blue in the sky on a sunny day. Polarization also controls in the reflections of light on the original colour of the surface.
The Heliopan Polarizer improves the colour of the sky, (in distant pictures, mountain scenes, etc.) it reduces the bluish cast in landscapes and increases the blue colour of the sky. The effect is strongest at a 90° angle to the sun.
In addition polarizers enhance the colour saturation of the scene by suppressing the reflections on the surface, undesired reflections are largely eliminated.