I'd like to get a thread going on general advice for "walk around night photography". What I mean by this, as an example, would be walking around a downtown environment at night, and getting good pictures of people, streets w/ streetlights, stuff like that. What would be the best lens / lens type for this? Can you get good results without flash? What settings are ideal? Any tips / advice are welcome. I just find myself "in the dark" (heh) when it comes to shooting at night - shooting parties, etc. I know there is the mode on my D7000 for it, but I want to understand what the camera is doing - i.e be able to walk into any given situation at night with my camera, a lens, and a flash, and be able to set it up properly. I can't be the only one!