Hi All,
If you have an ED80 and want to use your MEADE/CELESTRON F-6.3 Focal reducer with it there is one at a very reasonable price at:
http://www.clearvueoptics.com/adaptors.htm its a "DP2" and comes apart to allow the reducer to be inserted, then fits into the ED80, and has a screw for a "T" adaptor to the Canon, which you would have if your using the Camera on a Scope, I have one here (a DP2 on loan from a friend) and have tried it on a terrestrial picture which looks like its double the FOV to normal, waiting for a clear night to try it on the Sky, will post the results on "Deep Sky".
cheers..........Jim