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Thanks everyone for your comments, the collimation of the scope seems to be ok I am sure it must be stacking artifacts. All the subs were taken as jpg files and stacked in DSS then I used GIMP to process after stacking. I don't have Photoshop to remove then as you did Lewis but I tried every type of filtering method I could find in GIMP but no change, I converted every sub to tiff files and restacked but no change.
Next time I will try taking the subs in raw format (Sony ARW files) and see if that changes anything.
Thanks again, Wayne.
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