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I might add that if your collimation tools are accurate, and the scope is meticulously collimated, I have never seen a star test that could improve on the collimation, even at very high powers.
and star collimation doesn't help with secondary alignment.
I have seen poorly-collimated scopes that could be improved with star collimation, however.
But, the primary downside to star collimation is that seeing needs to be very very good to see the near-focus, high-power image with enough resolution to check collimation.
I suppose that's one reason to have a tool for primary collimation.
No tool collimation works fairly well on f/10 and longer newtonians, but not on today's faster scopes.
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