Strong thunderstorms throughout the Midwest US, tops up to 45,000 to 60,000 feet. From a distance with a 75mm lens it makes a spectacular display. Using a setting of 100 iso in the late evening hours allowed for a 5-second exposure time to make capturing these fleeting bolts a bit easier. Only a dozen or so high speed shots were needed to isolate 3 different strikes, this one being the one I like the best.