I purchased a UV filter to help protect my lens from scratches and the elements. I read a couple articles where people recommend them. But I did some more searching after purchasing mine and I'm finding a lot of people saying NOT to use one unless the shot requires it. I have a lens hood for my lens so that's pretty good for the protection aspect... but should I keep the UV filter on the lens? Can it make pictures worse off with it on? Will indoor shots with a flash look better with the filter off or will it not make a difference at all?