Quote:
Originally Posted by gregbradley
Your PEC Curve looks nothing like mine. Mine is much more gentle up and down with only a little bit above and a little bit below the midline on both my PMX and PME. As I recall there are different curve fitting algorithims you can use.
The first time I did PEC curves they looked like that and did not improve tracking on my PMX. I redid them on a night of good seeing and after I had improved PA and did a 20 minute run.
Was this done with Pempro or Sky X?
But the bottom line is do they work and if you are getting round stars in 10-15 minute exposures then you have arrived and I would stop fiddling with it.
Greg.
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Greg,
I used Pempro since I have never yet had a good result from TSX. Every single time I run PE measurement I get those little bumps. One person on the SB forum said those were pinion gear errors. I certainly have had terrific seeing on occasion and I still get the bumps.
Yes, I'm getting a decent correction result from the new curve. The purpose of my post was to 1. ask if changes in PE were common over time, and 2. to see if the amount of change I am now measuring is worth being concerned about.
I think I'm getting answers to both questions! I will be running the measurements again as I have tightened up the RA belt and I re-lubed the ring gear. I'm curious if this has changed anything.
Thanks for your input!
Peter