One thousand nine hundred and fifty 0.3 second exposures taken every 4 seconds for over 2 hours. The camera is mounted on a motorised pan/tilt head running at x1 sideral rate (15 degrees/hour).
The Canon 7D camera was connected to a laptop running DSLR Remote Pro which controlled the camera and downloaded the photographs to the hard drive. After 1,950 exposures the camera battery was only down to 40% capacity.
For the final sequence a 2 stop graduated Neutral Density filter and polarising filter was used.
The original is in HDTV1080i (1920×1080) this video is 1280x720