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If I do seek to tune out any residual coma, would I be changing spot size, affecting correction, and performance in some substantial way?
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Minute adjustments in the primary tilt can have a big influence on collimation. In my experience close enough is good enough. Where possible I've always avoided to change the primary tilt usually set at the factory.
If I had to do it then it was always a mechanical adjustment, not optical.
Tell tale of a misaligned primary is usually astigmatism and oblong on axis stars.