What does the distortion correction look like without the crop?Indeed. The image height of the 20/1.4 lens in the same patent is 18.90mm, the corner performance of that lens is excellent. This is the post-correction extreme upper left corner of an image from the 20/1.4 with Dubhe and Merak in the 100% crop (the two scoop-side stars of the Big Dipper that point to Polaris).
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As another example, here's a 100% crop from the post-correction extreme lower right corner of an image from the 20/1.4, and most of this image is from the part that was 'stretched' to wider than the original pixel width, as you can see from the full image in DxO showing the output size of 6492 x 4000 from the 6000 x 4000 sensor of the R1.
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