  We investigate the supercluster MS0302+17 (z~0.42) using weak lensing
analysis and deep wide field CFH12k BVR photometry. Using (B-V) - (V-R)
evolution tracks we identify supercluster early-types members. We derive a R
band weak lensing background galaxies sample. We compute the correlations
functions of light and mass and show that "light traces mass on supercluster
scales". The zeta-statistics applied in cluster centers and global correlation
analyses over the whole field converge toward the simple relation
M/L_B=300+/-30. This independently confirms the earlier results obtained by
Kaiser et al.(1998). We model dark matter halos around each galaxy by truncated
isothermal spheres and find the linear relation M L still holds. However, their
averaged halo truncation radius is s* ~< 200 kpc close to clusters cores,
whereas it reaches a lower limit of ~ 300 kpc at the periphery. This change of
s_* as function of radial distance gives indications on tidal stripping but the
lack of informations on the late-type galaxies sample prevents us to separate
contributions. Though all the data at hands are consistent with "mass is traced
by light from early-type galaxies", we are not able to describe in details the
contributions of late type galaxies. We however found it to be small.
