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Unless your guide scope is heavy, i cant see flexure as an issue.
80mm is not heavy, unless your rings are made of straw.
The main reason you get no trails when using an OAG is mainly due to the fact you are using a longer focal length (Main telescope), thus is able to detect errors faster and way before its detected in the guide scope.
The guide scope wont be able to see the errors until its large enough to be seen itself. By then, the main scope would already have that error recorded.
Theo
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