Mr Beam offers two types of camera calibration in the software settings: a corner calibration and a lens calibration.
The corner calibration is described in detail in the following article, and is generally required if one of the pink markers has been removed, or if there is a bigger deviation between screen picture and the laser result.
The lens calibration is described in the following article, and is made to remove the fish-eye effect from your camera picture. Only do this if you think that your camera precision is bad, specially in the centre.
We have also put together a video showing how to calibrate your Mr Beam camera correctly: