Three colour image (red H2 filter, green K_S, blue Brγ filter) of IRAS 20126+4104 obtained with PISCES and FLAO at the LBT in 2012 (top) and LUCI1 and the new AO system SOUL at the LBT in November 2020 (bottom). The K_S image used for the bottom image is that taken on November 4, that is the one exhibiting the best spatial resolution. Approximate positions of radio sources N1 (blue square), N2 (yellow square), and S (orange square, see text) are marked in the top panel with small coloured squares.