Infrared Imaging of SDSS Quasars: Implications for the Quasar K correction

We have imaged 45 quasars from the Sloan Digital Sky Survey (SDSS) with redshifts 1.85 = -0.55+/-0.42 with a large spread in values. We also find possible evolution of the form alpha_o = (0.148+/-0.068)z - (0.964+/-0.200)$ in the luminosity range -28.0 < M_i < -26.5. Such evolution suggests changes in the accretion process in quasars with time and is shown to have an effect on computed quasar luminosity functions.