When I was in high school back in '86, I built a "barn door" tracker to
take a couple of wide-field exposures of Comet Halley. I was amazed that it
worked.
Imagine my surprise upon finding out that a barn door platform was built on
the ISS:
http://science.nasa.gov/ppod/y2003/10apr_barndoor.htm
This has been used to take pictures of cities at night, as well as of the
night sky: (I hope this link works...)
http://eol.jsc.nasa.gov/debrief/Iss006/topFiles/ISS006-E-28028.htm
I just thought this was cool.
Marek Cichanski