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There are a couple of limitations, which Gary touches on in the article. The main one is that for a large dob or if you are trying it alone, adjusting can be difficult unless it is motorised. This is exacerbated by the high poer required, if I following the recommendation of 25x per inch I would need 500x on my 20" so a star wouldn't stay centred very long.
Also seeing needs to be pretty good as Jason said.
That said, doing a star test at the end as a confirmation that everything is OK is still a good idea.
Malcolm
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