A modified DSLR camera is a powerful tool in the hands of any astrophotographer. Depending on the model, it’s a fairly low-cost method to obtain results close to that of the big, expensive CCD cameras that are made just for astronomy. You can save even more by doing the modification yourself. My first modification, as described in a href="http://timsastroblog.blogspot.com/2006/12/going-deeper.html"this post/a, was completed one year ago and I have done several more since then. My goal at that...