Paul's Junkyard. 4 exposures of 5 minutes f/8 ISO 200 with an Olympus 18mm lens on the 5D Mark II (20 minute cumulative exposure). Light painting from camera right on the near side of the building and detritus. Exposure times were kept under 10 minutes because the temperature was relatively warm, and I didn't want to tie up the camera with noise reduction. Stacking images also allowed for flexibility on the final exposure -- with fast moving clouds, a 5 or 10 minute final image might have been necessary to retain detail. As it turned out, the best of both worlds was possible here -- clouds and stars!