In between clouds managed to realign the main mirror of the Tal and using a Hutech focal reducer with the adjustment ring for 800mm as a start took some pictures of Carina as a test.
Details Canon 5DH,3X180sec at ISO 1600,LPR filter,stacked with Registar and adjusted for the usuals in Photoshop.
1.7M
http://users.bigpond.net.au/avandonk/Car_Tal_FR.jpg
The field is noticeably flatter than without the focal reducer see
1.3M
http://users.bigpond.net.au/avandonk/Car_Tal.jpg
There is also a smaller pic showing the latest version of the focuser.
It is now a matter of finding the optimum width of adjustment ring on the FR to suit the Tal.
Bert