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Problem fixed - yippee
Thank-you to everyone who offered suggestions. Everything helps.
I have now solved this problem - it was a processing issue. I reset DSS to the default settings and it worked. My Grus Trio picture wasn't too bad for a 30 minute total exposure time. Focus was good - with some structure in the galaxies. I haven't looked in detail at the new parameters - and I don't know when/why I originally changed the settings.
I can now reprocess my old images and improve them a lot + I have several that I thought were no good that may be okay after all.
I just have to work on better guiding, longer subs and increase my processing knowledge.
I have a learned a few things - I now know that tightening the worm gear on a cgem is easy. My bahtinov mask seems to give a good focus. It pays to learn more about processing etc. I think I need to start including biases too. The hazy sky doesn't prevent pictures being taken - but obviously isn't good either.
Regards,
Tony.
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