  Distant clusters of galaxies provide a powerful method to study the formation
and evolution of galaxies, and large scale structure of the Universe. However,
the number of known clusters at high redshift (z> 0.5) is still very reduced.
As a preparatory work for detailed studies wigh GTC, we are searching for high
redshift clusters in public wide optical surveys. We will complement this with
near IR observations in 4 m telescopes. Here, we present some preliminary
results. In a field of 35 x 35 arcmin^2 we have detected 8 clusters of galaxies
at redshift z> 0.5.
