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Firstly, need to be sure the problem is in the scope, and nothing to do with the camera, so does Antares [or any other star, for that matter] come to proper focus when the scope is used visually?
I don't think it is air currents, because they cause irregular aberrations,
not regular, sharply defined ones like you have.
The images are definitely out of focus because the diffraction rings are
clearly visible. Although horizontally stretched, they are concentric, which
suggests that collimation is probably not the problem.
I noticed that the right hand side of the aberration has a straight, vertical
line, which suggests the edge of something. Is it possible that the camera's
mirror is not moving completely out of the light path, either because it is faulty, or maybe the adaptor you are using is fouling it.
Just some food for thought. This one is intriguing. Looking forward to
your next post.
raymo
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