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Thanks Bruce, Alex, Tibor and Peter for your coments!

I can conclude that my SNO-T has manufacturing defect. Thanks for recomending Bill Morris blog where he describes excatly the same problem and his solution.

Alexandre, you wrote that this Galilean telescope will be seldom needed. I agree absolutely. I have no problems with inverting scopes, becauce another sextant I have is SNO-M and it has only one telescope (inverting).

I was simply shocked of the fact that precision instrument could be manufactured with defects. I have found in the internet that the boxes of SNO-T are typicaly of very poor quality. Yes, they are really very primitive. But the instrument itself is quite highly rated. Bill Morris describes this sextant as “possibly the best ever made”.

I have finished my 3 year amateur’s project “Sextant SNO-M calibration by observations” (hundreds of observations from known position were documented and ploted into error graphic). Now I will start the next project by testing newly aquired SNO-T. I hope this instrument will be more accurate, because lunar sights are my favorite and it is so exciting to test the limits of the instument and the skills of myself.

Modris Fersters