Hi Chris
Have a look at the following from My Astro Shop:
Vixen Wide Photo Adapter 60mm - Canon EOS
http://www.myastroshop.com.au/produc...sp?id=MAS-053H
Vixen EA60 to 50.8mm Compression ring adaptor
http://www.myastroshop.com.au/produc...sp?id=MAS-080A
Another good looking adapter is the Baader - 4 in 1 Two inch visual back
http://www.myastroshop.com.au/produc...sp?id=MAS-026A
I have the Vixen ED102S which is the older 102mm F9 refractor and this offers a 60mm thread on the focuser tube.
I think that the 1st item above would probably be the most rigid whereas the 2nd and 3rd items use grub screws for a 2” fitting, although the Baader unit looks very solid and rigid.
Cheers
Dennis