MCAO test bench set-up at the IAC lab. Upper panel (label 1): current, complete set-up, while the bottom panels display a zoom-in of the main elements highlighted with arrows in the upper panel. From left to right of the bottom row, there is the extended light source and phase screens (label 2), the wavefront sensor (label 3), and the pupil deformable mirror (label 4). MCAO DMs will be added at a later stage.