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I'm going to chime in here....
If it were coma, you'd see it all around the edge of the field, angling out.
Have you checked that your camera is square to the incoming light (orthogonal)
You appear to be achieving focus to the centre of the image and to the L/H side.... totally out of focus to the R/H side.
I've seen this before!
I'd be checking all hardware extension tubes and fixtures into the focuser and also checking the focuser.
If your image train has any movement in the focuser or sag, then you need to fix this.
But even before this, you must start at the basics to confirm it's not something else....
Use practical process of elimination.
#1. Is the scope collimated?? (collimate it)
#2. check your focuser for any movement in the draw tube, any movement can relate to sag with camera attached, more extreme to different areas of the sky.. (new focuser??)
#3. Have solid threaded extension tubes into focuser... forget about putting cameras into a poor focuser with a measly single screw. If it's sloppy, you need to find a better solution.
Get these things checked and double check that they are all good then you can work on spacing of reducer....
Hope this helps..
Rich
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