It took me about an hour to catch one of these. I shot this with probably the worst choice in camera. A Canon Powershot S50 which is awesome for everything but time lapse photography. It has a 15 second maximum exposure and you have to wait 15 seconds after each exposure while the camera processes. But after about an hour of trying I got one!
This was shot at about 2am on August 13 2007 in Elizabeth, Colorado – about 50 miles South of Denver at 6000ft altitude on a perfectly clear Colorado evening.