Hi Paul,
Did you use Registax or AviStack for the quadrant image?
One of the problems I get with registax is that it stacks the area of interest well, but due to the usually average seeing and low power of the SM40 then edges of the frame don't stack well. I think I can see this in your image as well, there seems to be some ghosting of features away from the centre of interest (which I'm assuming you stacked on). If you haven't tried it yet, give AviStack a go, it works very well on this type of image.
Cheers
Stuart
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