>Clear filters can’t hurt IQ other than introducing flare or ghosts in backlighting. Or causing fringing, or reducing sharpness, or reducing contrast... The a

>Clear filters can’t hurt IQ other than introducing flare or ghosts in backlighting. Or causing fringing, or reducing sharpness, or reducing contrast... The absolute _best_ that a filter can do to IQ is nothing. But that's basically impossible. Every air/glass interface causes reflections, and no piece of glass is optically perfect. So it's going to hurt your IQ, the question is merely how much, and whether it's worthwhile. I used to use them. Then I decided I was probably never going to get much of anything reselling my lenses, so I might as well just use them instead of trying to baby them. Haven't had a problem with that decision, but YMMV.