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This phase manipulates the Calculate checkboxes and the distortion values for the quadratic, cubic, and quartic distortions, and the lens center. It can be used to supply initial estimates or known-good values. An initial solve might use Set mode, and force the value to zero. A second solve might use Seeded mode with an approximate value (again perhaps zero) that will then be optimized. Later solves might use Refine mode to continue calculating from the earlier solve, or use Lock mode to keep using the calculated value, with no further adjustment to it. A different shot with the same camera that relies on FOV and distortion from this would use Set mode with a fixed value.
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