Hi Gary,
To be honest, I haven't done a lot of astronomy work with the XT-3. I've done some moon shots at 1600mm and a widefield of Crux. PI did a pretty good job on converting the files IMHO.
I've previously owned Nikon DSLRs. Focusing via live-view is a similar experience. Noise seemed acceptable. Unfortunately I just haven't done enough shooting to give you an educated opinion - work and the weather seem to conspire against me...
DT
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