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I personal found focusing my ASI120MM-S and a guide scope in PHD a pain. I would use another software package to focus (I used MaximDL because I've got it but SharpCap would be good and free).
Following the SNR and FWHM numbers in PHD I'd think that I'm close to focus and then I'd check in MaximDL and it would be way off. PHD does an excellent job at dealing with out of focus stars and centroid calculations. It is because it does what it is supposed to do well that makes focusing a bit difficult.
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