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You need to set all those lines to the right of the curve Matt (hopefully you know what I'm dribblin' on about here)
As to focussing on dark images...get it so it's bright on the screen (it's beside the point how you do that...plenty of gain/brightness/gamma if warranted) then focus/lock the focuser....then set the settings as you would normally do & fire away! At least that's how I do it.
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