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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. 

Canon filters provide additional benefits of correction for Ultraviolet(UV) light which can register on film and videotape as a bluish cast and can obscure distant details

If desired it can be left on the lens at all times for protection