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oh wow, that's some great detail in the galaxy. Plenty of emission nebulae as well as dust lanes visible. I'll give this a go one day if the clouds clear, but my focal length is quite a bit shorter.
one thing it looks like you have some amp glow? affecting the lower part of the frame and some linear vertical artefacts generally. You might want to check your calibration frames, darks, flat etc.
EDIT i see you say using darks and flat darks but not flats? I use bias myself instead of flat darks, but thought flat darks need to be matched with flats to work
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