Colour filters Cokin colour filters are technical tools and just right if you want to achieve the following results: add warmth to your portraits, correct colour casts, suppress excessive brightness, eliminate the green cast of fluorescent tubes, simulate night shots in daylight, control the conversion of colours to greyscale in black and white photos, and keep UV radiation out. They are suitable for lenses with a filter thread up to 112 mm and are specially designed for today's digital SLR cameras. Use filters for light and colour control directly in the RAW file when shooting. Maintain the highest image quality by eliminating the need for post-processing. Create special effects without time-consuming work on the computer.