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26 October 2024 at 7:49 pm
#626089
Dr Paul Leyland
Participant
Thanks. It looks like a generic problem as your image also shows rings around the brighter stars.
Not a deal breaker as photometry is very tolerant of slightly blurred and/or trailed images and I want to do science and not artwork.
Anyway, such artefacts can often be cleaned up in post-processing.
It appears that my image is not properly focused. It should be obvious, but wasn’t, that auto-focus should be run every time before taking images. One day I will print a Bahtinov mask to see how well AF works. Reports are that it is pretty good.