The polarizing filter is one of the most frequently used filters in photography. Polarizing filters allow only light of a certain vibrational level to pass through, filtering out all other light rays. This results in a reduction of reflections on glass and water surfaces or lacquers. At the same time, polarizing filters increase color saturation and contrast, making objects behind glass (such as shop windows and car windows) visible again.

In landscape photography, the polarizing filter achieves its maximum effect at an angle of 90 degrees to the sun. For a uniform effect in the picture, it is recommended not to use a focal length shorter than 35 or 28 mm in the 35 mm format due to the uneven polarization of the sky light. Circular and linear polarizing filters function according to the same principle. Optical gratings on the filter ensure that only linear light waves whose orientation matches that of the grating reach the objective.

Unlike a linear polarizing filter, the circular polarizing filter includes an additional Lambda/4 plate. This plate ensures that the linear light rays generated in the polarizing filter are broken down into all their components and are at a 90-degree angle to one another, with one component delayed by a quarter wavelength. As a result, all polarization directions are available behind the filter again, eliminating the autofocus problems often caused by polarizing filters.

The circular polarizing filter boasts excellent optical properties. The multi-coated, high-quality glass lens is embedded in a precisely manufactured metal frame. The rotating filter operates smoothly and stops at the desired setting. It is transported in a protective cover that shields the filter from harmful UV radiation, significantly increasing its service life.