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I dont remember guideing with eggy stars, Marc may well be right that as long as the centroid can be calculated itll be all right, I certainly dont have a problem with out of focus stars. Can you post a pic?. Still leaves you with why guiding is jumpy. There are so many things to tweak in the guide software its hard to tell where to start, I found the best way is to have the guide error graph up and carefully watch it, tweaking stuff to see what effect each tweak has. Play with min and max moves, agressiveness and binning. Can you post a pic of the guide graph?.
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