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.