  We report on CCD optical (B and V passbands) and near IR (J and K bands)
observations in the region of the old open cluster NGC 2141. By combining the
two sets of photometry (500 stars in common) we derive new estimates of the
cluster fundamental parameters. We confirm that the cluster is 2.5 Gyrs old,
but, with respect to previous investigations, we obtain a slightly larger
reddening (E(B-V)=0.40), and a slightly shorter distance (3.8 kpc) from the
Sun. Finally we present Luminosity Function (LF) in the V band, which is
another age indicator. We provide a good fit for the age range inferred from
isochrones by assuming the Kroupa et al. (1993) IMF up to $M_V$=5.0. We
interpret the disagreemt at fainter magnitudes as an evidence of mass
segregation.
