The Lens Calibration needs a Charuco Board.
For different zoom/focus levels, various sizes of boards will be needed.
The board should have the size of a quarter of your actual image.
This size should be roughly the same also for different focus levels.
To reach this, 4-6 boards with different scale are necessary to calibrate the full range of the focus and the zoom.
The board should have roughly 12 to 16 squares across the width.
The amount of squares in the height must be odd, if the amount of squares across the width are even and vice versa.
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