Hi Mike, It's spherical aberration, a form of distortion common in cell phone and vest pocket cameras. Lines that don't pass through the center of the frame get more and more bent the further out they are. Lenses corrected for this form of distortion, which is only noticeable when straight lines are being photographed, are bulky and expensive. My Micro Nikkor lens cost more, and weighs more, than my camera.
Regards, Norm
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