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I have added another 10 mm extender - so the camera to the flattener is about 113mm - 120mm separated (the flattener has a threaded M48 tube with a lock nut). I only have about 5mm of separation between the focuser and the OTA - so tonight I will try focusing and seeing if I can improve coma - removing extenders about 5 - 10mm at a time!
I wonder if any of 113, 68, 55, or 46 mm (plus 1mm for filters) will end up being the correct separation!
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