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Thanks John, Michael, Alex and Glenn.
Michael , that background halo is present in my DSS stacked image. Not sure where it comes from ? optical train ? coma corrector not in correct position?
If anyone knows what causes this , please let me know. please see attached uncropped image that shows the halo better (also processed a bit differently).
There was also a fair bit of light gradient.
Tried to minimize the background halo but this reduced the star glow about the galaxy.
Glenn , I use the skywatcher quattro F4 coma corrector. I don't have an OAG but use a converted finder-guider with asi 120mm-s quide scope.
Thanks for the comments and tips, Rob
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