Hi, I was always irritated why Zapruder didn't (try to) keep the presidential limousine in the center of the picture all the time since this was what he wanted to film. After around frame 230, it seems almost as if the background was much more of interest than the limousine in the foreground - the limo is "diving down" almost out of the picture. At around frame 280 the picture shows 10% car and 90% background... Only after around 330 he is focusing on the limousine again. Does this only irritate me, and has there be any explanation for this?