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The field looks good Pete, I think that might be focus related issues with the stars. Only one corner is not affected by the stars appearing in rotation. I found with the TSA if the focus is not 100% I get this issue with narrow band images. Given the CFZ of the FSQ's I would not be surprised if it were focus.
However if it is tilt then any slight tilt will affect the focus in the corners. Easy to nut out though.
Look forward to your images from the eclipse.
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