I have just got the
TS2.5Flat from Teleskop-express . It can screw into the 68mm top on newer Moonlite focusers. I then have a
50mm extender tube / adaptor from that to my SBIG STL-11000 camera. The spacing is important I had it 15mm farther away in another configuration using the old GSO focuser and the corners were still not right. Now first tests are very good. The other issue was the Moonlite focuser standard issue was to long, Ron made me a special low profile one swapping out the main 2.5" body for a shorter one and a low profile flange at the bottom. I now have 15mm spare back focus to play with.