Orion ST 80 Guidescope
Celestron Nexguide Autoguider
After aligning the mount, the hand controller indicated I was within 10 arc seconds for Alt and 1 arc minute for AZ.
I setup the guider. It locked, calibrated and started guiding with no issue.
The camera exposure was set to 1 minute and 30 seconds.
When I look at the images, the stars come out egg shaped. I tried this 2 nights in a row and the stars all show some issues. The oblong area of the star does not always point in the same direction so this doesn't appear to be something mechanical that occurs the same way each time.
I tried to make an animated gif to show what this looks like over several exposures and I will post a single image as well.
Any ideas as to what is causing this phenomena?