|Comet C/2014 Q2 Lovejoy on the evening of Monday, January 19, 2015.|
I used an external interval timer to capture one-minute exposures until the camera's battery power ran out nearly 2.5 hours later. I had the camera placed on an inexpensive star-tracking mount to follow the comet as the earth rotated. I converted the resulting 147 exposures to video, and with 640 mm zoom, over the course of 2 hours you can see the comet move against the starry background!
Here are the time-lapse video results of several nights shooting, at effective focal lengths of 28 mm, 35 mm, 320 mm and 640 mm. The video is best viewed full screen, switched to HD 1080p quality:
I hope that I get more clear nights this month to shoot the comet, as it gradually moves away from the earth and the sun on its big lap of our solar system.