The Optical Head (OH) of the MAJIS (Moons and Jupiter Imaging Spectrometer) instrument which was delivered to IAS in mid-August has been calibrated at the IAS calibration facilities. This crucial stage in the life of a space instrument allows us to assess the performances of the instrument in conditions very close to those it will encounter in space, and to make the final adjustments to its control with the electronics spare (the electronic flight unit having already been delivered).