I use PHD2 for guiding but had not got around to seriously trying the polar alignment feature that it provides - drift align - until last night. I found a tutorial to try (
https://sites.google.com/site/openph...rift-alignment) and over time I manage to get improvements - I think.
I could not get the red line to flatten very far at all, although the magenta circle became quite small. No matter what I did, the result was such that the RA was still jumping all over the place when guiding (+/- 2" easily).
I'm trying to work out why that was happening. I suspect the seeing has something to do with it, but trying with 1,3,5 sec guiding didn't seem to make much difference.
Would backlash cause this? What about the aggressiveness setting - I did have it at 100?
Finally, DEC seemed to be quite good compared to RA - hardly any movement.
My setup for this is as per my sig. I was at 2000mm - no reducer.
Thanks for any suggestions/help.
EDIT: I guess I should ask what information I could attempt to gather tonight that might assist in working this out? Is there anything I could try to eliminate some variables?