This poll is leaning towards responses from experienced photographers in an effort to educate us less learned. However, all responses are valuable. I ask because with my first lens purchases, I put a UV filter on all of them. It was a habit carried over from film days of long ago. However, once I started buying quality glass for my dSLR and after reading some of the disadvantages of IQ, reflections, flare etc. I have not used them with the Gold Rings. I want to get the best possible image from what the manufacturer designed, especially when I drop 4 digits on the cost of the lens. 99.5% of the time I have the hard plastic/metal lens hood attached/extended and if I move from my shooting spot, the lens cap goes on. So for protection in a normal environment, it is a non-issue to me. The only reason I can think of to use one is in harsh conditions such as dusty, sandy, wet or in a thicket to protect the front element. Okay, add hazy to the list, but I think PS is a more likely solution if needed. So, the question is: Once you started buying Pro glass *read Gold Ring and L as examples * do you or do you not slap a UV / Clear filter as a protective measure? If so, please say why.