The Kodak 3 x 3" #25 Red Wratten Gel Filter for Tricolor/Color Separation Work is ideal for strong contrast improvement, since it absorbs green and blue completely, and enhances red.
Clouds are dramatically improved, almost to the mood of a thunderstorm. It is more effective in cutting through haze, and moonlight effects are easily accomplished. It is also suited for infrared photography.
Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), 14 x 18" (350 x 450mm) and 4 x 12" (10.2 x 30.5cm).
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3 x 3" (75 x 75mm)
Absorbs green and blue completely and enhances red
Create dramatic sky effects, emphasizing cloud contrast for landscapes Simulate a moonlit scene at midday with slight underexposure Use with infrared film to yield extreme contrast with skies, turn foliage white and cut through fog and haze