The Canon 127mm Ultraviolet (UV) Filter is a wise initial investment. It can help protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs.
A UV filter not only minimizes the bluish cast sometimes found under daylight conditions, but is also the best available protection against accidental damage to the front element of your lens. A lens that accidentally gets dropped on its front element while hiking can potentially be saved by purchasing this item. Some people refer to it as "cheap insurance". As a lens protector, it should be left on at all times.
Aside from that more-than-significant benefit, UV filters render your photos clearer, sharper and more contrasty. For those who enjoy outdoor photography, especially distant vistas, a UV filter can produce a more distinct and acceptable image by removing much of the blue tint normally associated with atmospheric haze.
Canon, a leader in optical design, provides quality glass that helps make your photography more enjoyable and successful.