best practices to get a good calibration result will be like the following sample picture:

  • Start filling the corner with a board size 70%-80% of the image. Rotate the board if necessary to allign to the boarder sides.
  • Tilt the board around 30° backwards and allign it to all boarder sides:
  • Tilt the board concurrently over two axis, centered in the middle of the image:
  • Increase the distance, so that the size of the board will be a bit less then 1/4 of the image size. Start again filling the complete image.
  • Tilt here as well the board around 30° backwards and allign it to all boarder sides:
  • Tilt the board over all axis in the middle of the image: