Natural light spreads straight in all directions in waveform. Pure sunlight is polarized and has a high color unit. When penetrating the atmosphere, part of the atmosphere is scattered, which overlaps all colors as a blue -gray haze. This proportion can often be weakened with polar filters or impede. If there is also light in the flat angle of approx. 35 degrees on a reflective surface, such as water, glass, plastics, colors (with the exception of metallic surfaces), the light is reflected and polarized. If a correctly oriented polarity filter is now used, the reflexes are absorbed and the pure colors can be on the film or Recording. Water surfaces are transparent, the blue sting by the sky polarization is steamed, the colors become far stronger and more richer. Heliopan polf filters are d.
eBay