  Here we present a pilot study into whether elliptical galaxy counts alone,
can place a useful constraint on the Omega_M - Omega_Lambda-plane. The
elliptical galaxy counts are drawn from three surveys: The Millennium Galaxy
Catalogue (16 > B_KPNO > 20), the B-band Parallel Survey (20 > B_AB >24) and
the Hubble Deep Fields (23 > B_AB > 28). The elliptical luminosity function
used in the modeling was derived from a combination of the Millennium Galaxy
Catalogue, the two-degree field galaxy redshift survey and the Sloan Digital
Sky Survey (M_*=-19.90, phi_*=0.0019/Mpc^3 and alpha =-0.75 for
H_o=75km/s/Mpc). We adopt a benchmark model and tweak the various input
parameters by their uncertainties to determine the impact upon the counts. We
find that IF the faint-end slope of the elliptical galaxy luminosity function
is known to better than 0.1$, then over the magnitude range 16 < B < 23 the
counts depend most critically upon the cosmology, and can be used to place a
weak constraint on the [Omega_Matter-Omega_Lambda]-plane.
