I have always used a UV filter for outdoor photography, especially at higher elevations to combat UV rays. I now shoot with a Canon 5D Mark II and my backup, a Canon 50D. I'm hearing a lot of conflicting info regarding whether or not I should be using my filters at all. I'm learning that DSLR's are not affected by UV light the way that film cameras are. Also, wondering if the filter(s) take away from the quality of the photo? I'm hoping to get some sound advice or opinions on filters and digital photography. Thanks!