Great stuff Mike. Colour is lovely, stars on axis are very good and image brightness is superb.
OAG will help you greatly. I will never go back to a guide scope again if I can help it. The benefits out weigh the frustrations by miles.
That is not collimation as a problem in the corners. You have field curvature there. As Greg said spacing needs to be sorted. When you get that right your stars will be pin sharp all the way to the corners.
Excellent start.
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