Okay well I'm very new at this and i don't know anything about filters. but anywho, i just got into photography and this guy at my work keeps pushing me along and today he gave me his old camera bag and in it he had a bunch of filters for me to have.. well first off are these crap? or not really? kay and then can anyone explain to me what and when you would use some of them? from my understanding a uv protractor is simply there to protect your lens right? oh and how much do you think their worth? he was telling me how he has probably $5,000 in total just in filters man i feel like such a dumb ass talking to him.