Congrats on your new scope.
127mm is serious APO aperture.
Thats a hot shot. Best to use screw fittings to get rid of that sag in the visual back screw setup. Depending on the scope there can be quite a bit of slop there. I had a Willimas Optics 80mm once and their 2 inch visual back seemed a tad bigger than 2 inches so sag was inevitable form the screw tightening.
Maybe its a sign to get yourself a CCD cam now for Xmas! There's so many nice ones to chose from these days and the prices will never be lower than they are right now.
Greg.
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