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I have some questions on your method, Steve. I'd like to try it out. I'm trying to refine by collimation and need all the help I can get.
When you mention the central stars should be perfect donuts, but the outer ones are elongated, shouldn't they all be donuts if you have a coma corrector?
When you say that upon refocusing, anything else unbalanced means there's a problem elsewhere, any tips on how to detect where to fix the problem?
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