This was done in Peterborough, Ontario, (Canada). The night before this I was in the same park and had the camera close to the ground looking up at the monkey bars and stars/clouds, but because of the low camera height and the sudden temperature drop, the lens fogged up after the first half-dozen frames and made my sitting out there for a few hours almost a complete waste of time - though I did learn my lesson: the next night I moved the camera much further from the ground, used the 2 seconds between some of the 28 second exposures to check the lens for condensation, (which of course didn't happen), and brought a couple of beers with me.
peterborough