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Geometric distortion test card camera SLR camera optical lens checkerboard grid HD test chart 400X300mm Checkerboard - AliExpress
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![4: The grid to the left is curved as a lens distorted image, the right... | Download Scientific Diagram 4: The grid to the left is curved as a lens distorted image, the right... | Download Scientific Diagram](https://www.researchgate.net/publication/265190953/figure/fig4/AS:295977148796934@1447577859559/The-grid-to-the-left-is-curved-as-a-lens-distorted-image-the-right-image-is-the.png)