I also tend to use a UV filter just to protect the lens. If, say, I am taking pictures where the camera will not be moving (for instance landscapes on tripod or 'portraiture') if I remember I will take it off. But, I find them rather handy, for instance, when I do experiments involving liquids, especially something such as milk such as earlier this week. I had cleaned the lens off after, but apparently missed a splash of milk on the UV filter When I pulled it out yesterday, I had to scrub pretty hard to get it off, and still, I can't be certain if it is all gone, so I am thankful it was my filter as opposed to the lens itself.