This high-quality circular polarizer filter is suitable for all DSLR lenses with a diameter of 77mm. This photographic equipment is a must have for any photographer! It has internal and external threads, so you can use your original cover and other filters. This filter can decrease distracting reflections on reflective surfaces like water, glass and windows (not metal). Furthermore, the CPL can steadily increase the saturation of the colours, it enables blue skies to seem bluer and clouds to seem whiter. This is a top quality product which makes the colours more saturated. The filter is made of a metal frame with internal and external threads, so you can screw on more lenses or different lens hoods. It also protects your lens from scratches.