I was doing the very tourist like thing of photographing the space shuttle. It is really hard to describe the amount of light and sound is created on a launch of the shuttles. I was using the 5D mkII my trusty f2.8f L 24-70 @ 24 sitting on a tripod. I was set up @ a marine on highway 520 on the Indian River. I think I could have done better if I had used a longer shutter time, this was a 20sec. An exposer of 30 or more whould have gotten more of the light trail. Oh well better luck next time.