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I have used SGP for a couple of years now. I have had the occasional issue but generally focus results have been good with both refractors and now a RC scope as well. I generally use 7 or 9 focus points and 2x2 binning. You have to ensure your step size covers enough ground to get a decent curve. They have suggested ways of calculating that and then you may want to tweak it. I use the Luminance filter for focusing and have calculated offsets for the other filters. This is much quicker and more reliable in the long run especially when using NB filters.
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