Canon Ultraviolet Filters:

The camera Ultraviolet filter manufactured by canon is solely made to protect your lens from any kind of dust, moisture and scratches.  This ultraviolet filter is ideal for leaving on the camera all of the time because it provides extra assurance in case of accidental drops. The UV filter is useful to reduce blush cast in day light.  This filter also provides you  no additional coloration or contrast that allows you to pair this filter with others as well.