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I am surprised a high end Feather Touch focuser is flexing. I ran quite a heavy load on mine with none. Proline 16803, filter wheel, MMOAG, guide camera, cables. All perfect.
The focuser probably has adjustment screws on the underside that may need tightening. There must be threads about how to do that.
How do you know its the focuser?
I might add that I used to get similar looking stars with a Starlight Express 694 camera. After chasing the guiding to no avail it came to light later it was the camera firmware that was making a bump on one end of the stars. A firmware fix from Starlight fixed it. Perhaps these Sony sensors are prone to that?
Greg.
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