New Professional Altura Photo 58mm CPL Circular Polarizer Filter – Works with any lens with a 58mm filter thread; manual or autofocus, digital or film. – CPL filters (Circular Polarizer) are great for removing unwanted reflections from non metallic surfaces such as glass or water. Take richer scenic shots and notice improved clarity in distant objects by cutting through haze and increasing color saturation. – This filter is mounted on a rotating frame allowing the user to determine the desired amount of reflection to be removed by simply rotating the filter. – These filters are double threaded allowing additional filters to be mounted one over the other. – Made of high quality optical glass and aluminum metal.