A complete NICMOS map of the Hubble Deep Field North

I present early results from a program to map of the complete Hubble Deep Field North (HDF-N) at 1.1 μm amd 1.6 μm with NICMOS on HST. The near-infrared data allow us to study galaxies at $\text{1<z<3}$ at rest-frame optical wavelengths where we are most familiar with the morphological and photometric properties of galaxies nearby. The images are sensitive to emission from redder, evolved stellar populations whose light redshifts out of the optical WFPC2 passbands at $\text{z>1.}$ The optical-infrared multicolor parameter space can be used to refine photometric redshift estimates for galaxies, and to search for galaxies at very large redshifts $\text{(z>5).}$ I present the observations, briefly discuss the morphological properties of the faint galaxy population, and illustrate one moderately bright object whose extremely unusual colors make it an interesting candidate for having a very large redshift.