I am having a problem with the tracking of my NEQ6 Pro and I would truly appreciate if someone with a bit more experience might have a look at the drift in the attached screenshots (I have highlighted the resulting drift of the image with a white frame for better visibility). As you can see in the „Position Drift Scatter“ (left graph) from Sharpcap, there is a more or less constant drift and I am curious how to fix it. I have tried several things already (please see next posts as well due to the file size limitation) but I am still not sure what is causing this drift.
Some basic information:
-I am using a 8“ F/5 Newton + ASI224MC (unguided for EAA) + Baader UV/IR Cut Filter
-The telescope is well balanced and stands (non-stationary) on a field for observing. I have tried different locations so I would exclude that it is caused by the underground.
-I control the mount with a laptop using the SynscanPro Windows app and I am plate solving with SharpCap. However, the drift occurs also when I am using the hand controller. Thus, I would exclude software problems as well.
-The drift occurs with and without cone error correction (see attachments in this post for comparison).
-Interesting observation: The images in post two were taken on the same night. The only difference is that I have turned the camera within the focuser (1:10 crayford focuser from Astro Professional (looks the same as GSO)) and that I have changed the exposure time. This seemed to improve the drift significantly. A close look also reveals that the stars are not 100% round despite focusing with a Bahtinov mask.
So currently I have two theories:
-It is caused by the focuser. If yes, how can I confirm and fix it?
-It is caused by a problem with the gears. So I guess, the drift could be fixed with a belt modification?
What do you think? I am happy about all ideas and answers :-)