Took the Tal apart and cleaned the optics after two years of use. It really needed it as focus was very vague. Took this test shot of 47Tuc with the Moon present (90%+).
Details
Canon 5DH, Tal 200k with Hutech focal reducer so 1790mm at F9, Hutech LPR filter, 2x8 min at ISO 400. Processed with Images Plus and Registar and adjusted for levels in PS.
800K
http://members.optusnet.com.au/~trlee8/47T.jpg
Bert