The Cokin color filters are technical tools that are perfect for various applications, including: adding warmth to portraits, correcting color casts, reducing excessive brightness, eliminating the green cast of fluorescent tubes, simulating night shots in daylight, controlling the conversion of colors to gray values in black and white photos, keeping out UV radiation, and taking analog or digital infrared photos. This size is recommended for lenses with a filter thread of up to 82 mm and a clear width of 84 mm from a focal length of 28 mm (based on the 35 mm full-frame format). They are specially designed for today's digital SLR cameras.