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What is your image scale for the guider and for your main OTA?
I take it that you are able to calibrate OK? How much PE do you have? Guiding a 90mm refractor is going to be a lot easier than a larger scope with I assume a long focal length. In fact you may need to guide through your imaging scope with an OAG to expect a decent result and to avoid flexure between your guide scope and OT.
Peter
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