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Barry and I were discussing this a few weeks ago when I asked for his input on why the Synscan PEC routine was behaving strangely. He suggested, among other things, using the AutoPEC in EQMod.
After recording 5 worm cycles (which takes a fair while), it kicked in and worked beautifully. I watched my RMS drop down to somewhere between 0.16 and 0.20 (at 900mm, in near-IR), compared to the 0.30 - 0.40 beforehand. This was with a PA of within 1-2'.
If the seeing up your way is really that bad, trying guiding in the near-IR. It can only improve the situation.
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