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I was trying to do that, but didn't quite get there this time. I realised later the most likely reason the focus was bad. I've done images in the past and I've had better focus across the disk. However this time I was using a "new" bit of gear to hold the camera above the eyepiece. I think I may have had it on a slight tilt compared to the "plane" of the eyepiece.
I should be able to test this theory next time by rotating the camera if I see the focus/out of focus areas change appropriately.
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