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2. Photographic filter - Wikipedia

   en.wikipedia.org/wiki/Photographic_filter

   Photographic filter. Four photographic filters (clockwise from top-left): an infrared hot mirror filter, a polarizing filter, and a UV filter. The larger filter is a polarizer for Cokin-style filter mounts. In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path.

3. Polarizing filter (photography) - Wikipedia

   en.wikipedia.org/wiki/Polarizing_filter...

   Polarizing filter (photography) Circular polarizer /linear analyzer [1] filtering unpolarized light and then circularly polarizing the result. A polarizing filter or polarising filter (see spelling differences) is a filter that is often placed in front of a camera lens in photography in order to darken skies, manage reflections, or suppress ...

4. Neutral-density filter - Wikipedia

   en.wikipedia.org/wiki/Neutral-density_filter

   A set of ND 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.

5. Wratten number - Wikipedia

   en.wikipedia.org/wiki/Wratten_number

   Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters almost always ...

6. List of photographic equipment makers - Wikipedia

   en.wikipedia.org/wiki/List_of_photographic...

   Foma Bohemia (Czech Republic) Manufacture of B&W films, X-Ray and Industrial films & contract manufacture. B&W photographic chemicals and papers [7] Fujifilm (Japan) Manufacture of Black and white and color film, instant film, Microfilms & RA4 paper. Fuji Hunt subsidiary producing color photographic chemicals.

7. Filter (social media) - Wikipedia

   en.wikipedia.org/wiki/Filter_(social_media)

   A photograph with two plush vegetables, before and after applying a filter. Filters are digital image effects often used on social media. They initially simulated the effects of camera filters, and they have since developed with facial recognition technology and computer-generated augmented reality. Social media filters—especially beauty ...