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I don't think his star is at 50m away, more like 30m. I'm also not too keen on looking at anything that much defocused. I don't know if it matters for a MAK as I've never had one, but for a newt or cassegrain, especially for a newt you can still have non concentric shadows that far out of focus for a system that's properly collimated. I love artificial stars and they have their place, but you need to add extension tubes at the back so your mirror spacing is as close as it is when focused at infinity and look at diffraction rings rather than secondary shadows. Then you finish with a real star test in any case for the final tweak.
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