I been struggling to understand why my guiding is almost twice as good when my target is in the northern sky as opposed to pointing south. Tonight I tried a few tests with an asi120mm mini, one test using my Celestron OAG and another using a 60mm guidescope. Both had similar results.
Target #1 The Orion Nebula
The OAG gets on average about 1.05" total RMS
The 60mm guidescope... about .92" total RMS
The OAG about .87" total RMS
The 60mm about .53" total RMS
As you can see there's a drastic difference between what the OAG and guidescope get when pointing to M82. But there's also a big difference depending on where the scope is pointing.
The main scope was rebalanced for all tests to be east heavy and dec balanced even or very slightly tail heavy.
Edit: I left PHD running tracking m82 and it's now averaging .47" total rms...
Edited by dally, 21 January 2021 - 01:31 AM.