G'day Baz, you're doing well. Have you Pec trained your nexstar mount?
No matter how well balanced your ota, if you have uncorrected
pE you'll get trailing over an extended exposure time. Autoguiding will mostly fix it, but pec training is valuable too. Your colour balance is biased to the green; not familiar with the program you are using, however it should have some sort of rgb presets for when you do the raw convert to colour. this is the best time and place to get your white balance correct.
keep up the good work,
Doug
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