This is my third attempt at a time lapse video of Comet ISON from this morning, Nov. 11, 2013, near New Market, Alabama.
I used a Canon 6D with Canon 200mm f/2.8 lens with Canon 2x extender, at f/16, ISO 1600, 77 60-sec exposures. Tracking with Astrotrac on a Ravelli tripod. Temperature was about 43 deg F.