Ok so here is a [crappy] repersentation of what I see the through the view finder of my old canon FTb. I know: A moves when I change apreture B moves up when I use slow lens speeds (2 & 1) C comes up when I use slow lens speeds (2 & 1) D shows the lens speed Questions: 1 What else do the show me? 2 How do they help? 3 Is their any thing else that moves or show me something that I didn't notice? 4 Does this camera have a TTL light meter?