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Alpha Crucis, Alpha Centaurus, Sirius, Canopus & Archenar are all stars that I've used for a 2Star Alignment. This has worked well for visual and imaging with a DSLR using an Orion 80 mm guidescope and PHD for guiding.
Hope that helps.
I think (but I'm not completely certain) that the 3Star alignment is to help overcome cone error.
Paul
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