Star trail photo: A first attempt

I've been planning on doing something like this for a while and finally braved the cold to give it a shot.  Next time I'll bring additional lights so I can focus the foreground, and it turns out that even in the middle of nowhere I'm going to be fighting ambient light.  Imperfections aside, I think it was a pretty good first attempt.  This was a bit more than 11 minutes exposure at f/8.