One of the shots that you just pan without using your head to find out what car is coming, thanks to some of the unconsiderate fans that kep standing and blocking my views to the incoming cars, in the viewfinder, you can only set the lens at prefocus distance, use your eyes to peep through the side and your ear to hear the high pitch (140db frequencies) to 'sense' any car is coming. In real life shooting, you can only see a 'cloud' of red, blue, black or green zooming through the little finder. Well, fortunately, you have these events only once a year, continueos turing your head dfrom left to right for few hours could develop some 'swaying heads' syndrome, I think.