Fujichrome Velvia 50, OM-4T, 24mm lens, 15 seconds at f/2.8.
"This represents one of the crazier things I've done. I saw the thunderhead coming, grabbed my gear and jumped in the car. I headed for the highest exposed ridge I could find, and set up my big metal tripod. I had clicked off about six uninteresting frames when these big bolts struck not too far from where I was set up!"