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I use the Hubble Optics artificial star. It worked for me at 22m for a 10" SCT.
Once well practiced, it's just as quick to collimate on a real star, but the artificial star is still useful for initial collimation after cleaning and replacing the corrector and/or secondary, fitting a new focuser, connecting a new camera, etc.
Practicing on the artificial star is a lot easier than practicing on a real one.
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