  We present accurate and deep multiband B,R,Halpha data for the globular
cluster Omega Cen collected with the Advanced Camera for Surveys on HST. The
photometric catalogue includes more than one million stars. By adopting severe
selection criteria we identified more than 600 bona fide White Dwarfs (WDs).
Empirical evidence suggests that a small sample of WDs are Halpha-bright. The
comparison between WD isochrones and observations shows a reasonable agreement
at fainter magnitudes and a mismatch at the brighter ones.
