I am an absolute noob when it comes to photography but I am very interested in photography. I recently purchased a Canon 40D and using the kit lens (28-135mm f/3.5-5.6). I'm looking to take some pictures in very dim to dark lighting. What is a good lens that takes pictures well in dim/very dim to dark lighting? I was thinking of a fixed lens since they have the biggest aperture but not sure what is best. Any help is greatly appreciated. Thanks.