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Its a relief to know that oval stars even with good phd graphs can be guiding issues. I didn't really notice if the index value was red.
Could it have to do with the FL of the guide-scope vs main scope?
So not enough movement of the guidestar in phd to invoke aggressive correction, but shows up in main scope?
The graph basically represents movement of the guidestar. So if that hasn't moved much in phd but shows up as oval stars, I can only think of the FL relationship.
I'm using the 8x50 finder guider and an 8" F4.
Come to think of it, I've never had oval stars with good graphs with an ST80 guidescope and I never had such a good graph with the ST80 either.
I've been so focused on ccd tilt and focuser tilt, I was almost certain it was my focuser not square to the optical axis.
Will go through Nathan's explanation again.
now for some clear skies to test out the settings.
edit: attached are two raw file examples.
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