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Thanks Jacquie - you are right so I have reposted my thread in the imaging forum.
Thanks Merlin 66 - I am using a Hutech light pollution filter and I thought this may have been the cause but images remain much the same when the
filter is removed. Saturation could be a problem but a one minute image of the Omega is obviously underexposed with respect to the nebulosity which is why I employed the stacking. Single images are little different from the stacked image wrt star colouration. I will experiment with a range of short to longer images. I will also have to see what the imaging forum people have to say!
Cheers Peter
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