What is Photographic filter?
[[File:Filters 6187.jpg|thumb]] A '''photographic filter''' is a [[Lens (optics)|lens]] that is used in [[photography]] to [[filter]] the light. There are different kinds of filters: *''Clear filters'', commonly known as ''window glass'' are put in front of a lens to protect the camera lens. *''UV filters'' are used to reduce the ''haziness'', strong UV filters can be used for ''warming up'' certain types of color photos in the [[shade]]. They can also correct some of the purple haze on certain digital cameras *Filters are used for ''color correction''; the main use there is to be able to use daylight-type film indoors, or indoor-type film outdoors. *Filters are used to enhance contrast. Examples for this are color filters (red, orange, green,..) in black and white photography or polarizing filters in color photography.<ref name = Socialshop >{{cite web | url = https://www.socialshop.co/10-best-instagram-filters-to-boost-likes/ | title = Filters to Improve Pictures | access-date = May 30, 2017 | archive-date = August 10, 2017 | archive-url = https://web.archive.org/web/20170810001110/https://www.socialshop.co/10-best-instagram-filters-to-boost-likes/ | url-status = dead }}</ref> *[[Polarization|Polarizing]] filters remove light with a certain polarity to reduce or increase glare, particularly from window reflections or water. *Neutral Density filters reduce light without changing the color. *Color filters remove light of a particular color. *There are special filters that must be used with film that is sensible to [[infrared]] light. *So called ''diopters'' or ''close-up lenses'' make the image bigger. They are a cheaper way to do [[macro photography]] *A ''diffusion filter'' shows a subject softer, by adding some 'fuzziness'; this can be wanted in some cases, usually [[portrait]]s of a person. Filters can be cheap or expensive. Glass (or plastic) that is treated or coated in different ways usually costs more. Some filters can be screwed in front of a lens that is made for this. Others can be placed in the back