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Thanks for the comments.
I wanted to do 40 subs, but time was against me. Wasn't sure on the exposure length either. I originally did 4 1600 ISO subs and a quick stage to see if it was pulling any details, and it seemed OK. I was going to drop the ISO to 400, but that would have doubled the capture time, so I stuck with 800 as a compromise.
Oddly while doing the first 4 subs, in the second one, the stars showed a short straight trail with about 5 brighter spots along it, as if the telescope moved sideways and stopped briefly each time. The only thing I an think of is if my dogs went out and were bumping the mount or something. Not sure what else would explain it except and earthquake....
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