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Hey thanks for the info Greg. I was thinking along those lines with the focusor, meaning I thought that the flexure was causing the issue.
The metal back distance for the TSA flattener is a minimum of 106 I think from memory. I checked this some time ago and as I understand it so long as I don't go below that distance it should work. I think with the TSA I am usually 117mm and this seems to work all the time. What I did not know is that I might be able to use the same flattener. That will be good if I don't have to buy another piece of kit. I had thought that each flattener was independently made for each type of OTA.
Apparently GSO make a flattener for this OTA, well at least that is what I read on CN and even on Astronomics but so far I have not found it.
Thanks so much for the feed back Greg, much appreciated.
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