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Bright is good -- to a point. Just don't let that guide star saturate the CCD. If you do, you're loosing accuracy in determining where the star really is. If you're at 3.5s of exposure and it's just picking it out -- yea, probably a bit dim and dim enough that when some light clouds come by, all is lost. But Sirius -- not so good to guide on! (assuming you blokes can even see it)
Craig
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