Sorry to reurect this thread but it seemed a good place to post this picture taken nearly 50 years ago give or take a few years. It was taken using High Speed Ektachrome probably pushed a stop (an amazing 250 ASA). I obviously needed artificial lighting and because electronic flash would have frozen the subject and I wanted to pan and blur the background I shot this with an FP class flash bulb. Even at the time I concluded I might be blinding the driver with the prolonged burst of light so I only took two using this technique.
