I need advice on the best/safest way to remove a damaged filter from a lens. I'll explain why: My ESO 10D and attached 17-40 L took a nosedive from my shoulder bag when somebody accidentally backed into me. The kit fell lens first onto a hard floor from about 4 ft. Luckily as there were a lens cap, polarizer and UV filter on the front which appear to have taken the brunt of the force, the lens itself seems upon initial inspection to have survived intact. I've also checked the camera and all functionality is there, though only time will tell if the electronics have had some sort of damage. The point is that after removing the lens hood and polarizer (by force), I'm having real difficulty unscrewing the UV which has bent slightly and seems to have locked the thread. Any advice on how to get this unscrewed without putting too much force on the front of the lens barrel?. As the UV glass has cracked and there are tiny shards of class on the front element of the lens, I need to take extra care not to scratch the coating, just incase that I have been lucky enough to get away with it!! Anyone been in a similar situation? Any advice will be greatly appreciated The only advice I can give in return is.... ALWAYS zip up your camera bag when you're carrying it around!!!! You have to laugh don't you! I must compliment Canon on the build quality. Now I'm gald I did'nt go for the 300D !!!!