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Hi Tony ,
Field doesn't look too bad , I suspect some asymmetry as on some sides stars look more round than others. Also some "chromatic" effects across some brighter stars . Is this an LRGB , OSC or a DSLR image? Have you checked your collimation? I have always focussed a star in the centre of the field using a mask then taken my pictures of DSO's in the centre of the field.
Regards philip
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