In 54 years, however, I've never needed or used one, without incident I might add. (so there) I was hoping that someone had run a real comparison with UV, without UV and using optical glass. I've heard that other shooters have noticed color shifting using UV filters. Although I do use UV coated flash tubes to prevent some organic pigments and some food products from flourescing and I have definitely noticed a difference between shots taken with and without those types of tubes. But as we know, to each their own.