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Hi there,
and thanks for your responses. Just to clarify, the camera has had the IR filter replaced with a filter from Baader (BCF). That filter allows passing of more Ha light.
The issue I am seeing is that in particular orange stars seem to have their halos shifted to towards the lower right image corner.
I was reading up on perpendicularity issues but noted that stars with blue halos are not equally affected.
That's why I was wondering whether the ED80 might produce coma in that spectrum or whether perhaps it's an issue with the filter assembly in front of the sensor or maybe a contribution of the CLS clip in filter and my camera not sitting square on the bayonet mount.
Maybe someone has experienced the same and found an answer.
I attached another image - same thing.
PS: last night I found out that stars appearing as straight streaks in the image are a result of the camera lenses image stabilisation.
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