The distance to the Leo I dwarf spheroidal galaxy from the Red Giant   Branch Tip
  We present V and I photometry of a 9.4 arcmin X 9.4 arcmin field centered on the dwarf spheroidal galaxy Leo I. The I magnitude of the tip of the Red Giant Branch is robustly estimated from two different datasets (I^{TRGB}=17.97 +0.05/-0.03). From this estimate, adopting [M/H]=-1.2 from the comparison of RGB stars with Galactic templates, we obtain a distance modulus (m-M)_0=22.02 +/- 0.13, corresponding to a distance D=254 +16/-19 Kpc. 
M. Bellazzini (INAF-OAB), N. Gennari (Bologna Univ.), F.R. Ferraro   (Bologna Univ.), A. Sollima (Bologna Univ.)