Last night I went out to do some street photography. As I was walking down the street I was also screwing in a lens hood on my Lumix 20 1.7. Well, my attention was elsewhere and the hood slipped and scraped right across the glass leaving a small scratch. It isn't too bad, but it feels like I just ruined my lens. Now I'm thinking about picking up some UV or clear filters for all my lenses. So, my question to you is this, do you guys use clear protective filters over your lenses, or UV filters, to protect the front glass? Or do you go commando front element? Last question, if you do use protective filters of any kind, do you feel it harms IQ? And which do you use, UV or clear? PS - For those photography geeks among us who felt my pain as you read of my 20mm's demise, don't feel too bad... I'm getting a good enough tax refund to cover replacing it with a Panasonic Leica 25mm f/1.4.