  We measure the field galaxy luminosity function (LF) as a function of color
and redshift from z = 0 to z = 0.5 using galaxies from the Norris Survey of the
Corona Borealis Supercluster. We find that our local r-band LF, when normalized
to counts in high galactic latitude fields, agrees well with the local LF
measured in the Las Campanas Redshift Survey. Our B-band local LF, however,
does not match the B-band LF from the Stromlo/APM survey, having a
normalization 1.6 times higher. We see compelling evidence that B-band field
galaxy LF evolves with redshift. The evolution is strongest for the population
of star-forming galaxies with [OII]3727 rest-frame equivalent widths greater
than 10A. The population of red, quiescent galaxies shows no sign of evolution
to z = 0.5. The evolution of the LF which we observe is consistent with the
findings of other faint galaxy redshift surveys. The fraction of galaxies with
[OII] emission increases rapidly with redshift, but the fraction of galaxies
with strong Hdelta 4101 absorption, a signature of a burst of star formation,
does not. We thus conclude that the star formation in distant galaxies is
primarily long-lived.
  We also compute the LFs of the Corona Borealis supercluster and the A2069
supercluster. The shapes of the two supercluster LFs are broadly similar to the
shape of the local LF. However, there are important differences. Both
supercluster LFs have an excess of very bright galaxies. In addition, there is
a suggestion of an upturn in the LF for galaxies fainter than M(B) = -17 mag.
  (Abridged from the abstract in the paper.)
