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Clear & ND фильтры
This section introduces Neutral Density (ND Filters) and clear filters
In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter, and is denoted by Wratten number 96. The purpose of a standard photographic neutral-density filter is to reduce the amount of light entering the lens. Doing so allows the photographer to select combinations of aperture, exposure time and sensor sensitivity that would otherwise produce overexposed pictures. This is done to achieve effects such as a shallower depth of field or motion blur of a subject in a wider range of situations and atmospheric conditions.
Clear filters.The filter protects the front element of the lens from scratches, dirt, water and other foreign matter, and can also make it easier to keep your lens clean, as you can simply remove the filter and clean that instead of the lens