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Thanks Hagar,
I do have some 5 min luminance subs that I could throw into the mix.
I am happy about the collimation of the scope. I ran the 2x2 bin subs through CCD inspector and it said all was good. Interestingly, the 1x1 subs had a slight "tilt". I think the problem was not having the focuser lock screwed down. The robofocus manual says to leave the lock unscrewed so that the motor is able to slide the drawtube in and out. Unfortunately, this allows some movement of the drawtube. I screwed the lock in so that it was just engaging on the drawtube and that seems to have removed most of the movement of the drawtube. In due course, I'll have a look at the PDF that was posted about adjusting the focuser - haven't had time to do that yet.
DT
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