Double MS-To of Terzan 5 in different CMDS. Upper left: the (H, J–H) CMD obtained from data secured with the infrared channel of the HST Wide Field Camera 3 (WFC3). Upper right: the (K, V–K) CMD obtained by combining the K-band laser AO-assisted images secured with Keck-NIRC2 and I-band images obtained with HST-ACS. Bottom left: the (I, V–I) CMD obtained with the HST-ACS. Bottom right: the (K, I–K) CMD obtained by combining K-band AO-assisted VLT observations with the deep I-band image obtained with HST-ACS. All the CMDs have been corrected for internal differential reddening and they refer to different regions of the system (see Figure 1).