Barndoor Tracker Movie (click on this link to see movie)

I recently pulled this old 2006 project out of mothballs and it still works. You mount a small camera or telescope on it. You point the axis at the celestial north. Turn it on and it follows the rotation of the earth, so you can take long exposure pictures of the night sky. I only took one roll of film using it and before I was able to take a good look at the results, the negatives disappeared, so I don’t really know how good it worked.

It features speed, direction controls and a clock for timing the exposure.