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Sounds pretty amazing. Your mods must have enhanced it. I have heard GPD2 is an accurate mount though. Although mostly zero errors I find hard to believe(do you use auto darks?). No errors does sound like your settings are unusual or a hot pixel which of course does not move is being used. But if you get round stars 30 minutes who can argue? That is a stunning result no matter how high end your gear is.
AP1600 has the best tracking of PMX, PME, Tak NJP, MI250, Vixen Sphinx and I get minor corrections every 10 seconds with perhaps no correction on half the errors.
I often get about .9 to 1 arc second PE which is the best I have seen. PMX was about 1.5-1.8, not sure what NJP was as no graph but probably 3 to 6, MI250 was probably about 6, PME is about 1.5. Sphinx was about 30!
PHD2 guide assistant will make recommendations for min/max move and length of guide exposures plus give a rough idea of how accurate your polar alignment is.
I am imaging at 1159mm and 40 to 43kgs of weight. The PME is carrying around 80kgs.
Usual seeing is around 2.5 to 3.5 arc secs judging by the guide camera guide star which again is rough, as focus is not as perfect on the guide camera (done by hand) compared to the scope. I have seen a few guide stars at 1.6 arc secs but not for long. A bad night must be 5 arc secs seeing. Not too common.
Greg.
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