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Robin, I think the second shot is very nice considering no flats, good focus and detail in the neb. You can take the flats at another time so long as the optical train is the same - eg FR, camera orientation and focus the same. I do not take flats for each run and leave the OTA setup untouched (except minor focus adjustments) and the flats seem to be reuseable probably not ok with the purists but I have a set for each config I use.
I can see a little field rotation in the image but I am being picky, at that image scale you should be very pleased - especially since all the gear is new(ish) to you. Apply some post-image run flats the image can only get better!
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