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Hi Alistair,
It's great see some good old fashioned ATMing being done here, we don't see alot of it anymore...makes me feel like getting the hammer and saw out.
Great start to imaging as well, as you say, lots to be tweaked yet, but it's got plenty of potential.
I think a coma corrector such as an MPCC would reduce alot of the coma across the field, they are a must for any Newtonian. Having said that, the coma is not symmetrical across the field, so something else will need adjustment too.
Have fun
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