VLT NACO JHK_s composite image of the Quintuplet cluster. Outside the dotted rectangle only H- and K_s-band data are available. The dashed circle with a radius of 500   pixel or 0.5   pc indicates the region used for the derivation of the mass function (see Sect. 5.2). Due to bad AO correction, the J-band dataset was unsuitable to perform photometry and astrometry and was used only for this composite image.