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With my 6 inch cometracker, it has a field thats not flat (being a schmidt Newtonian, schmidts have curved fields) , the coma corrector helps but not 100%. Theres very little coma just a field thats not flat, as if I rack focuser in, the centre becomes blurred and stars at the edge sharp. I try to hedge the bet and get centre a tiny bit out, edge tiny bit out and stars 1/2 way out perfect.
Scott
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