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Hi Lee
I'd suggest investing an oag and a decent guide cam. At f8, you'd need to acquire at least 15 min subs not considering other factors and for that your guiding needs to be good, an oag helps compensate mount tracking errors and ota flexure to a certain extent as it sees what your main scope sees.
I went from guidescope guiding with okay stars to oag guiding with round stars for 30min exposures.
Only thing, your guidecam needs to be sensitive as your guidecam fov would be very small.
Cheers
Alistair
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