One of the reasons I go the CDS-600D was to do some widefield with my Canon lenses. But they don't all seem to focus, and I can't change the f-stop on them. I think it's becomes they have electronic contacts and the connection to the CDS-600D doesn't. Maybe someone else has worked it out?
So I dug out my old Pentax lenses from an old SLR and they do focus. Some edge of field aberrations were present so I had to stop down to f5.6 and also clean them up in Startools. This was with 28 mm lens but I would like something even wider. Time to hunt ebay for old SLR lenses I guess.
Full res:
http://www.astrobin.com/full/93129/0/
Thanks for looking.