Last weekend I was at the Knoxville (IA) Nationals 410 Sprint Car races. Four days of the best sprint cars in the world after the $150,000 to the overall winner. 1200 pound cars with 900hp on a 1/2 mile dirt track with average lap speeds of approximately 125mph. These were shots from the infield during time trials. The air was so humid that it was creating contrails from the wings of the cars when they were at top speed which you can see in some of these shots. All of these were shot with my 135mm f/2 on a 5d MkIII. ISO was 3200-6400, apertures f/2-2.8, and shutter speeds were 500-640.