Safeguard your lens and absorb UV light. Film and video are more sensitive to UV light than our eyes are. This often shows up as a bluish cast in images, especially shots from high altitudes and long distances, particularly over water. Ultra Violet filters are available in a variety of UV absorption levels.
Reviewed by 2 customers
Works just like its supposed to. No distortion that I can tell. Never leave home with out a protective lens filter of some sort on my lens.
Low cost protection should not risk not to get one.