The most common problems people have with the lens calibration are as follows:
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Honeycomb bed is visible, confusing the circle-finding code. Cover the honeycomb with a bed sheet, cardboard, paper, wood, etc.
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Camera isn’t in focus. Focus the camera as well as you can to get a clear image. All of the LightBurn cameras are manually focused by twisting the lens
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Calibration pattern is too small (or too large) in the view - you want the pattern to fill roughly one of these squares for each capture:
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Calibration card printed incorrectly - if it doesn’t have exactly this dot pattern, it printed incorrectly:
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Poor or uneven lighting - If the card is unevenly lit, or part of it is in shadow, the circle finder can have a hard time detecting the pattern.
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Make sure the card is directly facing the camera (tilted toward it) if you have a fisheye lens, or parallel with the camera lens (flat, not tilted) if you are using a distortion-free lens.
See also: