Thanks guys.
I took hundreds of astro pictures before starting with Nextstar 4" SCT and then moving to ED80 mounted on EQ6 but I did not use autoguiding. Those pictures were so bad so I almost decided to quit astrophotography. However I gave it last change and could manage autoguiding to work.
Of course I still have a lot of things to learn i.e. image processing but at least now I know that I can take these great DSO pictures by myself :-)
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