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Let me second what Paul has said re PEMpro. I personally think TSX is busted for use in the Southern Hemisphere and I could never get any improvement in PEC using it for either my MX or MEII. But, with PEMpro I got my MX to go from 3 arc-sec error to around .6 arc-sec. I wouldn't be at all surprised if your uncorrected PEC was around 3-4 arc-sec. With a good correction you can do very well.
Actually you might want to use PEMpro before doing any maintenance at all. When you did your last PEC what was/is your correction using the curve you posted? I don't think looking at guiding corrections is a reliable way to tell if PEC is working or not given that guiding can often compensate for PE. Your guiding errors could be due to any combination of factors such as seeing, aggressiveness, exposure length, guider resolution, etc. I think PEC needs to be measured with guiding off.
Peter
Last edited by PRejto; 06-04-2015 at 01:22 PM.
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