We have imaged the Abrikosov vortex lattice on the surface of a conventional superconductor with a low-temperature magnetic force microscope, which is based on commercially available piezoresistive cantilevers. The heat dissipation at low temperature is limited by operating the cantilevers at higher mechanical resonances, allowing one to improve the signal-to-noise ratio by a factor of 3. Using a Co/Au multilayer for the magnetic tip coating, the interaction with the vortices can be kept small, and it is possible to observe a stable vortex lattice on the surface of a cleaved NbSe2 crystal. The stability of the vortex lattice can be understood in terms of collective pinning effects. © 1998 American Institute of Physics.