These two images of Comet Holmes taken two days apart (Nov.7&9, 2007) show striking architectural differences in the comet nucleus and environs depending on whether the tail was bright and attached or detached and fainter. A bright jet following the nucleus can be seen in the first image whereas there is no jet in the second which has a small faint nucleus following the tail detachment. These images are both 1.5 hour total RBG exposures through a 6-inch EDF Astro-Physics refractor using and SBIG STL-11K CCD camera. Short exposures of the coma showing interior detail were layer masked in to the long exposures using Adobe Photoshop.
http://www.spaceweather.com/comets/gallery_holmes_page14.htm