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Hi Gary,
Can you post an image showing these errors? I too had problems with stars on one side close to focus and stars on the other showing coma with stars in the middle being close to perfect and this is just with the Baader Coma Corrector in the imaging train until I used the extension tube that came with my scope and all is well with focus.
I bought the Bintel 8" f/4 and I am completely happy with it.
Paul
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