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Hi Matthew,
while waiting for some more knowledgeable folk to answer this, a few questions.
Is this the full frame? What is the image like without the OAG?
The coma I get and have seen is normally like StarTreks, Warp Factor Nine, and receding from the centre towards the corners, all four corners. Yours is more in one corner than all of them.
Maybe have another crack at stars only I find something like Omega Cent, centred is a good test, as there are enough dimmer stars about the frame to show coma etc.
Gary
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