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Polarizing filter

A polarizing filter is an optical attachment for a camera lens that allows only light with a specific polarization to pass through. Light waves oscillate in various directions, but after reflecting off non-metallic surfaces such as water, glass, or shiny leaves, the light becomes partially polarized—it begins to oscillate predominantly in one direction. This polarization manifests as glare and reduced contrast. The filter works by blocking these reflected, polarized light rays. By rotating the front part of the filter, the photographer can smoothly adjust the intensity of this effect. The result is the suppression of unwanted glare, making it possible, for example, to see beneath the water’s surface. At the same time, it enhances color saturation—particularly in blue skies—and accentuates contrast, such as between white clouds and the sky. There are two basic types: linear and circular. Circular polarizing filters, referred to as “CPL,” are used with modern digital cameras equipped with autofocus and automatic exposure metering, as they do not interfere with their proper functioning.

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