Hello... I am a little frustrated. I have a Canon Rebel XT DSLR with an 18-55mm lens. I am having a terrible time getting photographs to come out in low light. I specifically need to be able to get shots this October at Halloween events in different them parks. It is not pitch black, but it is a low light environment. I did some research and I was not sure what to make of it. I think I need a better lens? I understand the whole bit about needing to use a higher ISO and a faster shutter speed, but that doesn't appear to help that much.