Interesting stuff! Something to add to the list of things I want to photograph
to get REALLY good astrophotography images is VERY expensive. most folks use either a modified DSLR or a purpose designed CCD, and those start @ 2k. I'm thinking about sticking with the DSLR world. because there is more software support for Canon, I am thinking about getting one and an adapter to use my Nikon lenses, and then moving to a tube.