Concentrates attention on your principal subject. Allows you to isolate your subject in a group photo. COKIN Centre-Spot Filters are designed mostly for portrait and still life work. They also give excellent results with landscapes, architecture and sports, when attention needs to be drawn to the principal subject : for example a bunch of flowers, gargoyles, statues, details of architecture, a car hubcap, a ship?s wheel, etc. They may be used as coloured or neutral diffuser masks when the surroundings do not harmonize with the composition.