Coma on one side of image only

[Northernlight]

Hi All,

I'm setting up a new ES HR coma corrector and initial testing shows coma only on the left side of the image. I know the spacing between my camera and coma corrector isn't quite perfect as i'm waiting for some fine tuning adapter - Is this likely to be some sort of tilt issue. ? Maybe on the focuser 

Cheers Rich,

Edited December 29, 2020 by Northernlight
added photo

[Graham Darke]

The vignetting looks more pronounced on the left hand side. I’m not sure what that is indicating. 

[michael8554]

I'd suggest tilt.

More vignetting on the left side could suggest that the optical path is pointing slightly to the left.

Meaning the left edge of frame is very slightly closer to the camera than the right side.

Michael

[Northernlight]

So you think this is secondary rotation error ??