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The lodestar is more sensitive so you can pick fainter stars at a higher frame rate. Suited for an AO. Other than that if you guide let's say 1,2 or 3s any will do. You won't get any improvement in your guiding for using a lodestar. Unless the guide star is very faint or you use an OAG and have trouble finding one I wouldn't bother. They're pricy.
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