We present a spin resolving "momentum microscope" for the high resolution imaging of the momentum distribution of photoelectrons. Measurements of the band structure of a Au(111) single crystal surface demonstrate an energy resolution of δE=12meV and a momentum resolution of δk_II0.0049Å⁻¹, measured at the line-width of the spin-orbit split Shockley surface state. The relative accuracy of the k_IIk_II measurement in the order of 10⁻⁴Å ⁻¹ reveals a deviation from the ideal two-dimensional free electron gas model of the Shockley surface state, manifested in a threefold radial symmetry. Spin resolution in the full momentum image is obtained by an imaging spin-filter based on low-energy electron diffraction at a Au passivated Ir(100) single crystal. Using working points at 10.5 eV and 11.5 eV scattering energy with a completely reversed asymmetry of ±60 % we demonstrate the efficient mapping of the spin texture of the Au(111) surface state.