hi,
if the calibration is not starting automatically, it can be that:
- there is not enough locators, 7-8 are usually the minimum
- there is one locator badly placed.
select them one by one in the project tree and check that they are at the right place in the pictures. There is surely one which is wrong.
In this case delete it and put it again.
what happens if you force the calibration by clicking on the icon calibration ?
if IM says that the camera were not optimally calibrated that means that there is one is wrong (or not enough locators)
regards