Soon I will be going to Germany and Poland on a school trip. We will be doing walking Tours of Berlin and Warsaw as well as Tours of Concentration camps and Museums. I plan on taking a 70-300mm IS lens for outdoor shots during the Walking tours and a 17-50mm F/2.8 for indoor and Concentration camp photos. What I am wonder is how is the lighting in the Concentration camps? I am guessing it is dark? Would a 50mm f/1.8 be more suitable? and is a 70-300mm to long for general outdoor use?