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A colourless filter thats used to absorb UV light and reduce haze when shooting with black & white film.
A filter which is used in front of the lens in order to filter out UV light that can cause a blueish haze. UV filters have much the same purpose, but a skylight filter is also coloured slightly pink (or yellow) in order to give pictures a warmer appearance. In the digital age these filters are used less than before, since colour temperature can be influenced in-camera and in processing, especially when using the RAW file format.