This seems as good a place to ask this question as any. I've seen several old (turn of the last century) photos of race cars shot from the side as they raced past. The wheels have distorted into ovals leaning slightly forward. I remember reading years ago the explanation for this but at the moment I cannot recall what it is. I have not ever had the same happen in any photo I have shot and one time I tried to duplicate the effect with negative results. Does anyone know why this distortion was present in the old photos?