HOYA PRO 1 Digital Series Polarising Filter (Circular) - 55mm are designed specifically for use in digital cameras. The HOYA PRO 1 Digital circular polarising filter will allow you to remove unwanted reflections from non metallic surfaces such as water, glass etc. Light rays which are reflected by any surface can become polarised so polarising filters are used to select which light rays enter your camera lens. This HOYA PRO 1 Digital Multi Coated filter will also enable colours to become more saturated and appear clearer with improved contrast. - Digital Multi-Coated Digital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by reflections. - Black Almite Frame Filters feature a black matte aluminium satin finish almite frame which reduces reflections. - Black Rimmed Glass These filters are equipped with black rimmed glass to reduce the chance of light reflecting off the edge. - Low Profile Frame Ultra thin filter frames to help avoid vignetting on super wide angle lenses are also designed to hold a lens cap. - Knurling Edge Frame These filters are equipped with a straight knurling edge for non-slip, easy attachment and removal. - UV Protected Case Filter cases are UV protected to further lengthen the life of filters.