Newbie to DSLR here, awaiting my D80 to be delivered to ye olde electronics shoppe. I've heard using a UV filter is a good idea to protect your lense? I got the 18-135mm lense kit and I've noticed UV filters for pretty cheap on Ebay. Good idea? Bad idea? I searched on the forums but seemed to only be able to get a wide range of filter topics, not really specifically for this idea.