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That is very helpful as well, thank you very much!
I shall try again but with less backfocus. Hopefully there is an inflection point where the star pattern reverse so I have a ballpark idea where the optimal backfocus lies.
Interesting that you find moving IN helps, Chris. Given I use the Celestron OAG, the sensor is technically already a bit too far in, as the adapter threads onto the front of the reducer and isn't technically flush with the last piece of glass.
However, I will try adjusting backfocus again using shorter exposures.
Cheers
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