An excellent probe of both the disk and halo populations are the star clusters. In principle, the study of the mass spectrum is much easier in clusters than in the field. However, we have more and more evidences that the dynamical evolution of star clusters can make rather difficult to interpret the present day observed luminosity function in terms of initial mass function. A number of projects (a few of them already going on, e.g. with mosaics of small field images on small size telescopes, up to 3.5 m) could greatly benefit of a wide field imager on a 8m size telescope.
There are at least five programs of interest for the Italian community, which could be carried out with a wide field imager on the globular cluster stellar population: