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hey, my 10" is the same. i look at janoskiss's 8: and every single circle was centred and concentric. we collimated mine and mine wasn't.
star test is now the next trick. defocus a good half turn of the focusser and then start to slowly foucs, with the star centred at all times. if you can hold that round shape all the way to focus and out the othe side, you are there!!!
well done, i am sure it has been worth the little bit of pain for the gain!
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