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Hi Scott,
I don't know the answer to the fisheye lens distortion.
You could try drawing a circle with a compass on some white paper roughly the same size the secondary. Then hold it in position in front of the secondary and see what image looks like on the computer. That should confirm or deny whether the lens is distorting.
However you should be able to see the front edge of the focuser draw tube, does that look like a circle? If it does then the secondary must also be correct.
Cheers
Bill
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