When Canon entered the digital professional photography market, the Powers That Be decided they would compromise between the smaller sensor that Nikon used and the full-frame sensor Kodak was using for its short-lived pro DSLR line. The Canon EOS 1D definitely was a success and still is sought after, The designers at Canon, though, couldn't seem to let go of the full-frame sensor idea. Scarcely a year after the 1D, the company released the Canon EOS 1DS in late 2002. And it was/is a fantastic pro camera. Around two years later, the Canon EOS 1DS Mark II hit the shelves and it was just that much better. Both cameras still are viable options at low cost for using a pro DSLR camera. They're a lot of fun, too.