We present the photometric calibration of the Supernova Legacy Survey
(SNLS) fields. The SNLS aims at measuring the distances to SNe Ia at
(0.3<z<1) using MegaCam, the 1 deg^2 imager on the
Canada-France-Hawaii Telescope (CFHT). The uncertainty affecting the
photometric calibration of the survey dominates the systematic
uncertainty of the key measurement of the survey, namely the dark energy
equation of state. The photometric calibration of the SNLS requires
obtaining a uniform response across the imager, calibrating the science
Regnault et al., Astronomy & Astrophysics, accepted, arXiv:0908.3808
