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. This size is suitable for lenses with a filter thread up to 96 mm and is specially designed for today's digital SLR cameras. Use filters for light and colour control right from 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.