10-21-2020 02:26 PM
"I don't think there is anything wrong with the original sample shot."
That was my first thought, too. I continue to think so as it is easy to confuse distortion as something more when it is not. The test will prove it.
11-03-2020 11:37 AM
Thanks for the suggestions, I decided to try this with a whiteboard full of text and poiint my camera (placed on a tripod) at it. I don't think the lens is decentered based on this test.
While the corners are a bit softer yes, it's not as noticable and I found sharpening it in Photoshop made it look significantly better (with the exception of the bottom right corner, which usually doesn't do that in my real world testing.)