Unlike the 3D Optical Calibration, 2D Optical Calibration only calculates the 2D distortion generated by the headset's Optical configuration. This method is much simpler to setup. It only requires one stereo camera, which you likely already have for your headset! You can use the intel t261, t265 currently, but if you have another stereo camera reach out on the discord and we will see what we can do to support it.