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Just curious, I am not implying its flexure but its not mentioned in your posts what you exact setup is so it leaves it open. Do you have a photo of your setup.
Just so you know Yuri did test the FT3545 focuser and found minor flex under certain loads. It has less flex when it is upside down (focusing knobs up). Not that it flexes much. I have not seen focuser flex on my TEC180 and Proline, MMOAG and filter wheel.
What autoguiding system do you use? A guide scope or the ONAG?
Do you use all screwed adapters or eyepiece holders and extension tubes?
I have no experience with an ONAG. Is it reliable? Have you used it on other scopes/mounts?
I take it you've double checked your connections and everything is seated properly, the pick off prism is firm and does not wiggle etc etc.
Greg.
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