This paper describes the Sloan Digital Sky Survey photometric system,
a new five-color (u'g'r'i'z') wide-band CCD system with wavelength cov
erage from 3000 to 11 000 Angstrom. The zero points will be based on a
n updated version of the spectrophotometric AB nu system. This updated
calibration, designated as AB(95). is presented in this paper. (C) 19
96 American Astronomical Society.