Hi Johnny,
I have seen similar effects, but only on very small (undersampled) images. This looks more like it was oversampled, unless you're showing us a scaled up image post-processing?
Only thing I can think of is how good was the focus? Is it possible you have over sharpened a slightly de-focussed image?
Uranus is a tough target to focus on. I usually focus on a brighter star nearby, then swing back to Uranus for the video capture.
-Ivan
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