The cokin p series filter system is suitable for larger diameter lenses up to 82mm and is recommended for focal lengths from 28mm onwards 35mm format it features a wide range of adaptor rings including dedicated hasselbad b50b60b70 rollei vi as well as a universal ring and numerous dedicated accessoriesthis extra slim holder helps to eliminate vignetting down to 20mm focal length 35mm format and allows the use of filters with super wide lenses