I went on youtube and watched Harold Davis lecture on Night Photography ( http://www.youtube.com/watch?v=gdn3gJxSzew&feature=related ) and want to try some of the techniques he described. Some had 4 to 8 minute exposures. Audince member asked that question but he couldn't answer for all cameras. Figured I'd better ask some one first.
No matter how slow the film, Spirit always stands still long enough for the photographer It has chosen. Minor White Visit my Nikonians gallery.