After much hype in the media, Comet ISON turned out to be a huge disappointment. During almost all of its approach toward the Sun, it was cloudy in Portland, preventing me from imaging it. The skies finally cleared on November 21, 2013, only days before it's disasterous perihelion. That morning, the comet rose very low on the horizon during twilight and seeing conditions were very poor, so I could only image it through a great deal of roiling atmosphere with a bright background sky.  The comet was moving very rapidly, with noticeable changes in position on the camera frame in only a few seconds. After acquiring only 5 thirty-second sub-exposures,  the frames became overwhelmed with twilight and were unusable. Despite these difficult conditions, the color difference between the teal coma and the reddish dust tail, as well as detail in the dust tail are apparent in the resulting image. The next day, ISON was so close to the Sun that I was unable to acquire it. It subsequently broke up during its perihelion and did not emerge on the other side of the Sun. I have not found any "nighttime" image of ISON taken later than this one posted anywhere, so this image may be its final portrait. Exposures: 2.5 minutes at f/7 with Canon EOS 20D DSLR at ISO 1600.