Red 25. This popular filter creates dramatic sky effects, emphasizing cloud contrast for landscapes. May be used to simulate a moonlit scene at midday with slight underexposure.
With infrared film, this filter yields extreme contrast in skies, turns foliage white and cuts through fog and haze.
-Medium red filter.
-Darkens blue sky creating dramatic contrast between sky and clouds.
-Creates greater contrast between foliage and flowers.