  Using homogeneous CCD photometric data from the 105-cm Kiso Schmidt telescope
covering a 50' x 50' field, we study the mass functions (MFs) of nine open
clusters. The ages and Galactocentric distances of the target clusters vary
from 16 - 2000 Myr and 9-10.8 kpc, respectively. The values of MF slopes vary
from -1.1 to -2.1. The classical value derived by Salpeter (1955) for the slope
of the IMF is \Gamma = -1.35. The MFs in the outer regions of the clusters are
found to be steeper than in the inner regions, indicating the presence of mass
segregation in the clusters.The MF slopes (in the outer region as well as the
whole cluster) undergo an exponential decay with the evolutionary parameter
\tau (= age/ relaxation time). It seems that the evaporation of low-mass
members from outer regions of the clusters is not significant at larger
Galactocentric distances. It is concluded that the initial mass function (IMF)
in the anticentre direction of the Galaxy might have been steeper than the IMF
in the opposite direction. A comparison of the observed CMDs of the clusters
with synthetic CMDs gives a photometric binary content of ~40%.
