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Thanks Greg and Rodney.
I think Ray AKA Shiraz might be better at explaining this than me. I think the sensor well fills quickly and hence only short subs are required. The drawback to this is that you stack a lot of images!
I live with skies of Mag 19.5-20 and the optimal exposures at Gain 139, f5 optics is 15 seconds!
I hope that Shiraz can clarify this point.
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