Optical follow-up of the REFLEX survey: a new perspective in cluster   studies
  After the completion of the catalogue built with ESO key program (REFLEX), we are beginning to explore the multiband optical characteristics of a subsample of those clusters selected in a statistically independent way. We have already observed in B, V, R, 9 of the about 50 clusters of the subsample, with 0.15 \le z \le 0.18. More time has been allocated by ESO for our project in March 2001. We will therefore be able to compare X-ray and optical morphologies and luminosities and, thanks to the large field of view of the WFI instrument, assess the luminosity function and the color segregation in the cluster on a robust statistical basis. In this poster we present the project, the technical problems we are facing in the reduction phase, and show the first preliminary results, which seem very encouraging. 
L. T. Barone (1,2), E. Molinari (2), H. Boehringer (3), G. Chinarini   (2), C. A. Collins(4), L. Guzzo(2), P. D. Lynam(3), D...