The Hoya Ultraviolet (UV) Pro 1 Digital Filter is a wise initial investment. It helps protect your valuable investment from dust, moisture and scratches, which lead to costly repairs. Digital camera CCD or CMOS sensors are susceptible to reflections. Stray light can ruin photographs with flare and ghosting. Hoya Digital Multi-Coating reduces internal reflections, which means a clearer image + greater contrast. A UV filter minimizes the bluish cast sometimes found under daylight conditions, it is also the best protection against accidental damage to the front element of your lens. Some people refer to it as "cheap insurance". UV filters render your photos clearer, sharper and more contrasty. a UV filter can produce a more distinct and acceptable image by removing much of the blue tint normally associated with atmospheric haze. Hoya puts, at least, one layer of anti-reflective coating on each side of their glass. It is not bare glass. this kind of production tends to minimize flare and ghosting. Digital Multi-Coating takes this protection to a higher level. Pro 1 Digital filters are ultra thin, but have a front thread Digital Multi-Coated Digital multi-coated filters greatly reduce the appearance of lens flare and ghosting caused by internal reflections that can be a problem with CCD and CMOS sensors Black Almite Frame Filters feature a black matte aluminum, 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, which help to 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, which further lengthens the life of filters If desired, it can be left on the lens at all times, for protection